Posts Tagged ‘car tyre’

Tell Tale Tyres. What Wear Patterns Mean

Wednesday, February 1st, 2012

Car tyre forensics seems like an odd concept. However, in many instances, a ‘dead’ tyre can give you as much information as a corpse in the hands of a police pathologist. Information? Yes, tell-tale signs that can tell you what caused the tyre’s untimely demise. Such information is useful because in indicating possible faults, it can tell you what might require fixing to give your replacement car tyres or tyre the maximum possible life.

Let’s start with the basics. The type of tyre wear pattern that’s to be expected is straightforward, and is characterised by the tread’s having been worn away to the extent that the tyres’ tread wear indicators are at or near level with the surface of the tread. So, the tyre has nearly finished its useful service life. Is this the end of the story? Not necessarily. The suspension geometry on some cars can mean that the tyres’ treads don’t necessarily wear completely evenly.

Other car tyre tread wear patterns tell a different tale. What must be borne in mind is that they don’t necessarily tell it quickly – some wear conditions take a while to show that something is awry. For example, what does feathering on both outer edges of the tyre tread suggest? This pattern is the most likely indicator that the tyre has been consistently run at too low a pressure. Conversely, a strip worn around the centre of the tread indicates a tyre having been run at too high a pressure.

What about feathering on one edge of the car tyre tread? Should such wear be on the outer edge of the tyre, it suggests that the car’s steering is misaligned, having too much toe-in. Similarly, feathering on the tread’s inner edge indicates that there is too much toe-out. This kind of wear usually appears on both front tyres, as the steering will generally attempt to run straight and true. The fact that the steering tries to compensate for misalignment by effectively evening out the wear on each side of the car is no compensation in itself. However, it does advise you to have the wheel alignment checked before your new tyres suffer.

It’s worth noting that feathering on one side of a car tyre tread occurring only on one side of the car indicates something other than misaligned wheels. In this instance, one-sided feathering is more suggestive of wear in the car’s suspension joints, its springs and/or its wheel bearings. This pattern can also occur when the wheel’s camber, its position in relation to the vertical plane, is incorrect. Camber change of this kind can be caused by wear in the aforementioned areas; damage to the suspension can cause the same problem.

‘Cupping’ is also a phenomenon that can show you something is amiss on your car. A tread with cupping (also called ‘dipping’ or ‘scalloping’) has patches of wear across its tread’s surface. This can look almost like the tread surface has softened in places, or has been scooped away. Cupping indicates one of two problems or a combination of them. Wheels significantly out of balance can suffer cupping, as can car tyres under the control of worn shock absorbers. Cupping can affect rear tyres but it’s more commonly seen on a car’s front tyres.

As you can see, car tyre tread wear can be the result of maladjustment but wear and damage can give similar results. In the interests of your wallet, if not your life, pay attention to what your car tyres are telling you.

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Merityre.co.uk are one of the leading UK independent suppliers of car tyres. Why not visit their website for an online tyre quote or contact your nearest fitting centre.

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Winter Wisdom. Meeting Bad Weather Car Tyre Challenges

Tuesday, January 10th, 2012

The usual seasonal symptoms are back again. In the UK, winter presents a series of tough tests for car tyres. As well as your tyres, it is you who are on test – drivers, rather than cars, generally cause accidents. Here are some salient points about winter driving…

Snow and Ice

A mountain climber’s crampons, the tracks on a Caterpillar tractor, the toothed drive belt on a snowmobile…certain things are made to grip on snow and ice. Since (with some exceptions) you can’t fit such things on your car, you have to cope, using the tyres your car usually wears. There is, however an option. When the temperature drops, your usual tyres will lose flexibility. Winter car tyres are designed to retain their flexibility at lower temperatures, so it makes sense to invest in a set. Motorists are discovering that such car tyres really do offer significantly enhanced grip and control, and using them on a set of  (preferably steel) ‘winter wheels’ will preserve your usual alloy wheels from the ravages of salt and grit.

What are the exceptions? Countries with permafrost can be home to car tyres with studs. In the UK, seriously bad conditions can trigger the use of snow chains. A new item occupies the middle ground. Snow socks are car tyre covers made of a tough, woven material. Easier to fit and quieter than chains, they can be useful when drivers are caught out by unexpected snowfalls. Bear in mind that they will wear out in no time on tarmac.

Rain

When it isn’t quite cold enough to snow, rain and sleet present car tyre challenges of their own. Reduced visibility is a foregone conclusion but don’t forget that wet weather compromises grip. Your car tyres will move surface water but a wet surface remains relatively slippery. Remember to leave more room between you and the vehicle in front, to allow for increased braking distances.

Flooding

Lots of rain can lead to flooding. Standing water can be dangerous. When your car tyres hit it, you’ll feel the steering wheel pulling in response. At worst, your tyres may aquaplane. When the tyres ride on the surface of the water, suspiciously light steering signals radically reduced grip. If you feel this, lift off the throttle and slow down until the grip returns.

If you encounter a flood, remember that negotiating it requires care. Keep to the crown of the road, where the water will be shallower, and look out for the white line. This will help you gauge the depth of the water. While you can trust your tyres, remember that your engine, if it sucks in water, will be wrecked. Keep the engine revs up to help stop the exhaust inhaling water. However, if you are in any doubt whatsoever about the depth of the water, use another route.

Fog

In thick fog, you’re bound to suffer loss of visibility. Your car tyres won’t suddenly offer greater grip just because you notice that you’re hurtling towards the back of stationary truck. So drive as fast as you can see, and no faster. Remember to use your windscreen wipers and washers often in fog; your screen can collect water and grime surprisingly quickly, further reducing visibility.

In winter, the watchword is caution. Even on winter car tyres, grip will be compromised to some extent by bad weather. Should the visibility and grip be truly awful, simply put your feet up by the fire and live to drive another day.

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Merityre.co.uk are one of the leading UK independent suppliers of car tyres. Why not visit their website for an online tyre quote or contact your nearest fitting centre.

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Top Ten Car Tyre Tips

Tuesday, January 10th, 2012

Car tyres don’t generally ask too much of you. However, neglecting them can prove expensive and, in some circumstances, dangerous. These ten tips will enhance car tyre life, reduce your spending and perhaps save your life.

1. The wrong car tyre pressure is costly. Running on overinflated tyres accelerates wear and reduces both grip and ride comfort. Underinflated tyres also wear more quickly, and can worsen fuel economy by as much as ten percent. Check your tyre pressures regularly.

2. Cuts in car tyres are obvious. Lumps or bulges may be less so but they tend to indicate damage inside the car tyre’s carcass. Check for any such damage while correcting tyre pressures. If in any doubt, avoid the risk of a blowout by having a tyre specialist examine the damage.

3. A spare wheel with a flat tyre is worse than useless. Check the spare tyre pressure regularly, unless you have run flat tyres or an onboard tyre pump and repair kit. Remember that space saver spare tyres generally have speed and distance restrictions.

4. If, at car tyre checking time, you find a stone embedded in a tyre tread, you can lever it out before it causes damage. However, if you find a nail in a tyre, leave it alone. The nail will be temporarily keeping the air in – have a tyre specialist take a look. He may be able to repair the tyre.

5. While using the tyre inflator at a garage, or a tyre pump at home, look after the tyre valve dust caps. They keep dirt and grit away from the delicate valves, and are a line of defence against tyre pressure loss. Always put them back carefully.

6. Potholes can damage more than your car tyres. Hit a large one hard enough and you could be facing a bill for the repair or replacement of one or more wheels. Should you be unlucky enough to encounter a big pothole and suspect damage has occurred, stop and examine the affected wheel(s) and tyre(s).

7. Never straddle a speed bump. Instead, let the wheels on one side of your car pass over the bump. This will prevent damage to your car’s tyres, steering and suspension. When negotiating speed bumps and road-width speed pads, slow down or face the cost of repairs.

8. When you’re manoeuvering, curb your enthusiasm so you don’t kerb your car tyres. Kerb impacts can wreck not only tyres, they can scratch, chip and even dent your car’s wheels. Steering misalignment can also result from kerbing.

9. Keep your car in a garage, if you can. Car tyres suffer from prolonged exposure to ultra violet light. This leads to cracking and crazing of the car tyre sidewalls’ structure.

10. When the time to buy replacement tyres rolls around, think about replacing all four. Should this be too costly, always have new tyres fitted in pairs. It’s accepted that the new tyres should be fitted to the rear wheels.

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Merityre.co.uk are one of the leading UK independent suppliers of car tyres. Why not visit their website for an online tyre quote or contact your nearest fitting centre.

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Winter of Discontent… Beat it with Winter Tyres

Thursday, November 3rd, 2011

Last night’s frost warning was a harbinger of the approach of winter. Here in the UK, we should be used to harsh conditions. However, give us an inch (of snow) and the miles aren’t covered…the country tends to come to a grinding halt. Is there a solution? Well, the increasingly popular winter car tyres may help.

This begs a question: are winter tyres genuinely useful or are they just a way of extracting more money from we motorists? Let’s see.

Recommended in Andorra, Italy, Norway and Switzerland, winter tyres are compulsory in Austria, Germany and Sweden and mandatory in Finland. These rules naturally apply on snow-covered roads and/or during the snow season. Often, there is the distinction that the tyres must be marked ‘M&S’ (no, not Marks and Spencer, the marking stands for ‘Mud and Snow’.) Newer snow tyres may have a symbol of a snowflake in front of a mountain. Currently, the distinction between winter and snow tyres is a touch unclear. A good tyre bay will advise you of the exact designation and specification.

In fact, specification is what winter tyres are all about. Car tyres in general are made in much the same way but the rubber compounds used and the tread patterns vary. Winter tyres are made with a high silica content. The probable tread pattern has two tricks up its sleeve. One is a more aggressive tread pattern than ‘summer’ car tyres. This is present to enhance grip.

The winter car tyre tread’s second line of defence involves a winter tyre key word, flexibility. When ordinary tyres have to work in temperatures below 7 degrees centigrade, they stiffen up in the cold conditions. In winter tyres, the compound and tread pattern both improve flexibility.

The benefit of winter tyres is that they give better grip in cold conditions, in rain as well as when snow and ice are about. There are plenty of subjective reports concerning car tyres and most of those concerning winter tyres are favourable. In some cases, cars found to be pretty hopeless in snow are transformed!

Are winter tyres the car tyres for all seasons? Their name offers a huge clue here. Summer tyres will outperform winter ones on dry roads and in reasonable temperatures, and winter tyres, having a softer compound, will naturally wear faster. This suggests following the lead of many continental drivers. They have two sets of tyres, one for winter, one for summer.

This brings us, in turn, to a potentially superior arrangement, which is also popular on the continent and in some cases is a legal requirement. Generally speaking, car tyres can handle most road conditions. However, in the depths of winter, the environment down at road level can be especially harsh. Car tyres may be able to cope with the salt and grit that gives some winter grip but our alloy wheels can suffer. Many popular cars have base models that wear steel wheels. One solution is to have a set of winter tyres on these. A set of steel wheels, with winter tyres, balanced and ready to roll can be fitted when the thermometer starts to plummet. With these ‘winter wheels’ fitted, your car can take on whatever the season has to throw at it, while your pristine summer wheels can live in cool, dark storage, ready for Spring. Bear in mind that suitable wheel nuts/bolts will have to be factored into the equation.

What’s the bottom line? Assuming you need to use your car in the off season, winter car tyres are worth the investment.

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Merityre.co.uk are one of the leading UK independent suppliers of car tyres. Why not visit their website for an online tyre quote or contact your nearest fitting centre.

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A Bit on the Sidewall – What Car Tyre Markings Mean

Thursday, November 3rd, 2011

All car tyres have them but not everyone knows what the markings moulded in a tyre’s sidewall means. At the very least, it is necessary on many cars to check the sidewall as the tyre pressure to be used can relate to the tyre size. However, this little trip through the meaning of the markings will inform, especially when the time to buy new tyres arrives.

Here, we can use a theoretical, typical car tyre. Let’s say it’s marked 185/55R13 91 H. Confused already? Don’t be, things will become perfectly clear! Take the tyre markings one by one….

185 – This is the width of the tyre’s section in millimetres, i.e. the width of the carcass of the tyre, not its tread’s width. 185 millimetres is a little over seven and a quarter inches.

55 – This figure refers to the tyre’s aspect ratio, which is the height of the tyre height expressed as a percentage of its width. 55 is a low-ish profile but aspect ratios can go as low as 30%. Low profile car tyres grip well and deform little but the cost is reduced ride comfort and poor protection against potholes, kerbs and road debris.

R – This couldn’t be simpler. Here, R means radial.

13 – This number refers to the diameter of wheel the tyre will fit. Why this is expressed in inches rather than millimetres isn’t clear but it is standard practice.

91 – This is the tyre load index, a code for the maximum load capacity of the tyre when driven at its maximum rated speed. The figure 91 means a rating of 615 kilograms.

H – This final marking shows the tyre’s speed rating. This H rating means the tyre can cope with extended use at a maximum speed of 130 miles per hour (210 kilometres per hour). The highest possible speed rating is Z. Car tyres thus marked are capable of maintaining 150 mph (240 kph).

There are numerous other markings on a car tyre’s sidewall, some of which are for the tyre fitter’s information. For example, if the tyre has a specific direction of rotation, there will be an arrow. A ‘TWI’ marking denotes where the tread wear indicator(s) are moulded into the tyre’s tread. A coloured dot will show the tyre fitter where the tyre casing should sit on the wheel in relation to the valve. There will also be ECE (not EEC) type approval markings, possibly special construction markings, such as M&S (Mud and Snow), and a maximum pressure marking.

One marking that could be of interest to you is the DOT code. The last four numbers in this show the tyre’s date of manufacture. Four-digit codes began after 2003 so if your new car tyre has the code 2 5 0 9, it was made in the 30th week of 2009. Tyres over 6 years old must never be used.

All very interesting but do these markings matter to you? Apart from the aforementioned tyre size vs. tyre pressure element, the speed and load ratings are extremely important. Why? Because at best, using under-specified tyres is illegal and can invalidate your car insurance. At worst, the wrong kind of tyre can fail and cause a potentially lethal accident at high speed.

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Merityre.co.uk are one of the leading UK independent suppliers of car tyres. Why not visit their website for an online tyre quote or contact your nearest fitting centre.

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Inside A Car Tyre

Wednesday, September 14th, 2011

Many people take their car tyres for granted, but there’s far more to them than meets the eye. Knowing how they are made will illustrate this point.

How is a car tyre made? Production starts with a halobutyl rubber sheet that has special air-retaining additives. This sheet forms the tyre’s inner liner. A three-layer body ply comes next, in which a central layer of reinforcing fabric is sandwiched between two layers of rubber. Cotton used to be the material of choice for the reinforcing fabric but this has been replaced with Nylon, Rayon, polyester or even Kevlar. The body ply’s role is to give the tyre strength and flexibility; two such plies may be used in a tyre.

The acceptable faces of the tyre, the sidewalls, include antiozonants and antioxidants to enhance their life. The sidewalls can resist chemical attack and abrasion, and the tyre’s ratings and size codes are moulded into them.

Of course, the tyre’s sidewalls need to form a seal on the wheel rim. Bands of high tensile steel wire, copper or brass coated for corrosion resistance, form the beads on the inner diameter of the sidewalls. The triangular rubber section that joins the beads to the sidewalls is called the apex. The bead structure is what forms an airtight seal with the wheel rim.

Now for the tread and its underlying structure. The belt package is the part of the tyre that sits inside the tread. It’s made up of two layers of rubber that enclose a layer of steel cords. These cords run radially in the belt package, hence the term ‘radial tyres’.  The belt package is a major player in the tyre’s strength. The tread pattern is visible but the rubber compound used to make it is just as important. The choice of compound is a matter of a selecting a balance, between hardness (wear) and (grip). Think ‘compromise’.

These are the parts of a tyre and they must obviously be assembled and made into a tough, resilient structure. This procedure begins with wrapping the inner liner, body ply(s), sidewalls and beads around a special drum. Then, the belt package and tread are added, and the various elements are spliced together. At this stage the tyre is yet to be cured, and is known as a ‘green’ tyre. In this state, it is inflated and shaped.

Curing comes next, to bond the various parts of the tyre into a coherent whole. A rubber bladder is inflated inside the tyre, forcing it into a mould. Hot water, steam or an inert gas is used to inflate this bladder, and the curing process involves a great deal of heat and pressure…350 degrees Fahrenheit and 350 pounds per square inch to be precise. The curing process takes about 15 minutes.

The final stage is to test the cured tyre on a mock road surface, to seek out localized inflexibility and significant imbalances. Every tyre is given a visual inspection and sometimes, an X-ray inspection too.

So, car tyres are built tough to be tough, which they must be to take on the tough job they do. As they are all that keep your car on the road, it’s reassuring to know how much effort and care go into making them.

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Merityre.co.uk are one of the leading UK independent suppliers of car tyres. Why not visit their website for an online tyre quote or contact your nearest fitting centre.

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Ten Car Tyre Tips

Tuesday, January 11th, 2011

Your car’s tyres are literally your lifeline;  they are essentially all that is keeping you on the road. Neglect them at your peril. The following 10 tips will certainly save you money and they could well save your life, and the lives of innocent bystanders.

1. Check your car tyre pressures regularly. Running tyres at too low or too high pressure causes wear and speeds the deterioration of your tyres. Moreover, too low a tyre pressure means you will use more fuel; economy can improve by 10 percent when the tyre pressures are correct.

2. Regularly check your car tyres for cuts, bulges or lumps. While the former is obvious, visible damage, the latter can indicate unseen damage within the tyre carcasses. Having a specialist check out any suspect tyres makes far more sense than risking a blowout.

3. Unless you have one of the modern onboard repair kits with a pump, always carry your spare wheel. Remember that there are limits to the speed at which space saver spare tyres can be used, and the distance they can cover.

4. Potholes are car tyre killers, they can damage not only your tyres but even your wheels. You inadvertently strike a pothole and suspect damage has occurred, check the relevant wheel and tyre as soon as you possibly can.

5. If, when checking out tyres, you find a sharp stone embedded in a tread, remove it before it does any damage. However, if you spot a nail, leave it there as pulling it out will cause the tyre to deflate. A car tyre specialist will deal with it for you and may be able to repair the tyre.

6. When checking tyre pressures, remember to replace the valves’ dust caps. These prevent dirt and debris from entering the valves and can help maintain tyre pressure.

7. If possible, keep your car in a garage. Car tyres are tough but exposure to all weathers can accelerate their deterioration. Sunlight damage is common; the ultra violet component in the sun’s rays can cause cracking and crazing.

8. When negotiating speed bumps, never straddle them. Allowing the wheels on one side of the car to pass over the bumps is no faster but it will keep your suspension and steering happier. When you encounter a speed pad running across the entire width of the road, go over it slowly.

9. When the time to replace car tyres comes, it’s best to replace all four. Should this not be affordable, you must replace two of the tyres. Having the new tyres on the back wheels is regarded as the safest.

10. Car tyre specialists don’t just sell and fit tyres. A good specialist will be happy to advise you on the best choice of tyres for your car and for the use to which you put it.

Following these simple tips means you tyres will reward you with good performance and a long service life. Conversely, ignoring your tyres can lead to unfortunate and possibly dangerous circumstances.

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Merityre.co.uk are one of the  leading UK independent suppliers of car tyres. Why not visit their website for an online tyre quote or contact your nearest fitting centre.

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Stop and Swap: Changing A Flat Tyre In Five Steps

Tuesday, December 14th, 2010

Changing a car wheel with a flat tyre is a relatively easy task that can be done safely, provided you follow the rules. Here’s how it can be done in five basic steps, with a few tips to maintain safe progress and make life easier.

1: Stop in a safe place, with a smooth, firm surface

Never, ever try to change a car tyre and wheel on the hard shoulder, it’s better to drive on slowly and risk ruining the tyre. Switch on the car’s hazard lights and have any passengers stand well back and away from passing traffic. Extract the spare wheel and tools from the boot, using the warning triangle if there is one. Switch on the car’s hazard warning lights.

2: Loosen the wheel nuts/bolts

Put the handbrake on, putting the car in ‘park’ if it’s automatic. Remove the relevant wheel trim or the wheel nut/bolt caps, if present. You’ll need the special ‘key’ nut to remove a locking wheel fastening. Next, loosen the wheel nuts/bolts. These usually undo anticlockwise and you should always be pushing down on the wheel wrench, not pulling upwards.

3: Jack the car up

Put a chock under the wheel diagonally opposite to the one with the flat tyre. Place the car jack under the jacking point nearest the loosened wheel – never try to use the jack anywhere else. Wind or pump up the jack until there’s enough clearance under the wheel to allow for the replacement fully inflated tyre to fit. Don’t allow any part of you get between the car and the ground.

4: Change the wheel

Turn the wheel until one of the fastenings is at the top. Remove the other three (or four) nuts/bolts first. Then unscrew the topmost fastening. Lift the wheel off, keeping your back straight and taking care not to slip. Fit the spare wheel, aligning the fastenings. Replace the topmost nut/bolt first, followed by the remaining ones. Tighten the fastenings until the wheel is fully seated on the hub.

5: Tighten the wheel nuts/bolts

Let the jack down completely and set it aside. You can now tighten the wheel fastenings firmly, working in a diagonal pattern.

You can no go on your way but there is one more step, for which you’ll need to go to a car tyre bay. Car wheel fastenings should be tightened properly and a tyre bay will use a special wrench to do this. While at the tyre bay, it makes sense to have the flat tyre repaired or replaced as necessary.

It’s also worth making some preparations before you experience a puncture; these can make life much easier.  Changing a wheel is a grimy job so carrying some industrial gloves and a mat or piece of carpet in the car can make life much more pleasant. You may also want to familiarise yourself with the wheel changing equipment. Is it accessible? Is it all there? Is the jack there? Does it need lubricating? Better to find out before the event.

Finally, have you got a space saver spare? These usually have limitations concerning speed and distance. Also, space savers can cause dashboard warning lamps to come on, because they confuse the car’s sensors. Your handbook will warn you if this is going to happen.

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Fascinating Facts About Car Tyres

Monday, December 6th, 2010

Car tyres. We tend to take them for granted and, though they aren’t fit and forget items, we tend not to invest too much time in looking after them. Provided we regularly check their pressure and physical state, car tyres generally get on with their job, quietly and efficiently.  However, the following facts might open your eyes, about car tyres in general and about particular aspects concerning them.

Imagine fifty-five pence. That shiny heptagonal coin and its small circular counterpart are capital. However, the idea that you are throwing this much away with every gallon of fuel you use is a less than capital idea. Yet, running your car tyres at less than the recommended pressure can cost you 10 percent in terms of fuel economy. As under inflated tyres are harder to move along the road; they give the engine more work to do and this means more fuel is burned.

The law is an ass, said Mr. Bumble, in Charles Dickens’ ‘Oliver Twist’. He wasn’t talking about car tyres but the principle nevertheless applies. The law says that your car tyres must have no less than 1.6 millimetres of tread. Legal? Yes. Sensible? That’s arguable. A mere 1.6 millimetres of tread is generally accepted as cutting things fine. Tyre manufacturers mould two millimetre-deep tread wear indicators into tyres, with good reason. It’s arguably better to comply with the spirit of the law here rather than the letter, as the consequences of an uncontrollable skid in wet conditions cost a great deal more than new tyres.

What makes car tyres grip the road? The different types of tyre – all weather, winter, mud and snow, all terrain and performance – share common elements. The hardness or otherwise of the rubber in them and the tread pattern they have make a major difference in terms of grip, tyre life, on-road behaviour and longevity. In general though, it is the hardness (or softness) of the tyres’ compound and the water-clearing abilities of the tread that make the most difference to the level of grip given.

There’s nothing better than a new set of car tyres, is there? Some have found out to their cost that brand new tyres aren’t necessarily as grippy as their predecessors. The good news is that this relatively lessened grip doesn’t last long. If car tyres weren’t coated in an anti-stick compound during manufacture, they’d never leave the mould. This coating has to wear away before full grip is achieved. So run your new tyres in, driving more carefully for the first 500 miles or so. This is particularly important in wet conditions.

More than 40 million car tyres. That’s a lot of rubber but it is the number of tyres that are disposed of every year. Following EU directives means that comparatively few tyres go into landfill these days. Some are treated to new treads, minced tyres become carpet underlay and some wind up as part of new road surfaces. Plans are in progress to recover energy from old car tyres; they could replace coal in some industries.

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Merityre.co.uk are one of the  leading UK independent suppliers of car tyres. Why not visit their website for an online tyre quote or contact your nearest fitting centre.

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Beating Winter: Car Tyre Tactics For Bad Weather

Thursday, November 18th, 2010

It’s that time of year again. The days are short, the nights are long, precipitation is up and the mercury’s dropping. Your car’s tyres may be nearly new but there are limits to what they can do. So here are a few tips to help preserve life and limb even in the worst conditions.

There are no such things as magic tyres, despite some people’s believing that their car tyres have prestidigitatory properties. In fog, for example, your tyres won’t stop you instantly, just because you haven’t seen the line of cars up ahead in time. Equally, your tyres can’t suddenly give you enhanced grip because you need to swerve around a similar obstacle. Drive only as fast as you can see.

Rain is another condition that requires caution. Standing water in particular can be extremely dangerous.  Car tyres can dispose of surprisingly large amounts of surface water. However, when there’s too much to shift, they ride on the water surface instead. This is aquaplaning; in short, it equals no grip. Drive only as fast as your tyres will allow.

Floods are an altogether different matter. Hitting a large body of water standing a third of the way across a road at speed might give you vicious steering pull but you’ll get through if you allow for this. In deep water, your car tyres will cope admirably but your car might not. Many cars nowadays have a low-mounted air intake. If this inhales water, the engine will be wrecked. Don’t enter floodwater unless you’re certain of its depth. Keep to the crown of the road where the water will be shallowest. Keep the engine revving, to prevent water entering the exhaust and drive slowly – you have a car, not a boat. If in any doubt at all, find another route.

Snow and ice and car tyres don’t always mix. Winter tyres are a boon and it’s worth considering acquiring a set, especially if you live somewhere that experiences these conditions regularly. The usual, all-round car tyres can’t get a grip on ice and snow, even if they’re gracing a 4X4. When conditions are really bad, you may need to consider some additional hardware. ‘Snow socks’ are a new idea. These tough, woven tyre covers are easy to fit, quiet and grippy. However, they don’t last long on tarmac. The alternative is snow chains; not so easy to fit but far tougher, if noisy.

Above all, winter driving requires caution. Grip is always compromised to some extent and if you try to drive normally, losing control becomes a very real possibility. Remember also that your vision is likely to be compromised as well. Remove snow or ice from your car’s glass before moving an inch and always think about stopping distances. Modern electronic aids, such as traction control and anti-lock braking systems help but they’re no more magic than car tyres are. Should the worst come to the worst, and vision and grip both come under the general heading of appalling, you don’t have a choice. Stay at home!

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