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Choosing the proper tyres for winter
 
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چهارشنبه 2 بهمن 1392 :: نويسنده :دالین   


Telegraph journalist Chris Knapman visits the Porsche expertise Centre to place winter and summer tyres to the take a look at
This is exactly things wherever the owner of a four-wheel-drive SUV ought to be feeling contented .
http://www.tyre-shopper.co.uk/system/images/W1siZiIsIjIwMTMvMTEvMDQvMTQvNTYvNDAvMTQ1LzE1X1BpY2tpbmdfdGhlX0Jlc3RfVHlyZV9mb3JfV2ludGVyXzIwMTNfUmV2aWV3c19hbmRfUHJpY2luZy5qcGciXV0/15%20Picking%20the%20Best%20Tyre%20for%20Winter%202013%20%E2%80%93%20Reviews%20and%20Pricing.jpg
Sat at rock bottom of a hill, its surface sheeny with ice, you push the accelerator to the ground and wait all of these big-ticket differentials to try and do their job.

You creep forward, however not as you would possibly suppose, for whereas the speedo is ascension it's wheel speed and not road speed that you’re gaining. The handwheel has gone lightweight in your hands and has very little influence on your direction of travel, inflicting panic as your two-tonne automobile begins to wander toward the verge. You stop before you hit something, however currently you’re stuck. And you’re desire you had endowed in a very set of these winter tyres that everyone keeps talking concerning.

In fact, the right term is cold-weather tyres, however “winter tyres” has become the vernacular thus that’s what we’ll follow. And to check specifically however sensible they're we have a tendency to spent on a daily basis at the Porsche expertise Centre at Silverstone, that with great care happens to possess its own "Ice Hill" snuggled between the high-speed take a look at tracks. This seven per cent slope options a low-friction surface and 2 computer-controlled water jets to simulate the sort of conditions that for the last 2 years have sent British roads into a state of chaos.

Time to place into observe what we have a tendency to preach.
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A machine drive automobile on winter tyres is best than a four-wheel-drive automobile on summer tyres...

Having close to (and it absolutely was a detailed thing) managed to zag zigzag our thanks to the highest of the Ice Hill in a very four-wheel-drive Cayenne on summer tyres, we have a tendency to ar planning to strive one thing slightly totally different.

Climbing down from the large SUV I land within the seat of a rear-wheel drive, superior Porsche Boxster and come back to rock bottom of the Ice Hill. In theory the Boxster shouldn’t stand an opportunity here, however as I slot the gearlever into drive and contact the throttle it begins to maneuver. Be too formidable with the ability and also the rear wheels can still spin, however with slightly of restraint it ascends hill with ease, its steering crisp and controlled. The distinction, of course, is that it’s sporting winter tyres.

...but a four-wheel-drive automobile with winter tyres is best once more

With that expertise below our belt it’s no surprise to search out that swapping to our third and final automobile, a four-wheel-drive Cayenne on winter tyres, we have a tendency to create it to the highest of hill with ease. In fact, such is that the grip on supply that you just have to be compelled to be quite aggressive with the controls for any price dramatic to happen.

It’s an identical story once we place the cars through a slalom, this point travel down the Ice Hill. On summer tyres the Cayenne doesn’t even create the primary flip, understeering dispiritedly before threatening to travel into a large spin. strive constant within the Boxster on cold-weather tyres and you continue to got to work the steering, applying [*fr1] a flip of opposite lock as you guide the automobile between the obstacles, however the distinction is that as presently as you straighten the handwheel the tyres regain grip.

Again although, it’s the Cayenne on winter tyres that puts within the strongest performance, weaving through the slalom while not a haul. And it’s not simply that you just will see and feel the grip, however you'll hear it too, the tyres thrumming blithely as they bite into the surface.

Four-wheel-drive may facilitate to you get going, however it’s of no use once you’re making an attempt to prevent
http://www.auto123.com/ArtImages/124427/winter-tire-ice-snow.jpg
Our driver within the Cayenne on summer tyres might need had a torrid time aiming to the highest of hill, however currently there he will continue on his manner. Before he is aware of it he's heading back downhill once more at a gradual 24mph once, within the distance, he sees a lorry has jack-knifed and is obstructing the road. He brakes as onerous as he will, however whereas he will feel the ABS system pulsing through the pedal the automobile sails forward, its speed barely decreasing because the tyres glide across the paved surface. thereon same seven per cent Ice Hill it takes fifty five metres to return to a whole stop. From the driver’s seat it's, quite candidly, terrifying.

Behind, the Cayenne with winter tyres is travel at precisely the same speed. recognizing the lorry at constant purpose it too performs Associate in Nursing emergency stop. once more the ABS pulses, however this point the nose dives because the tyres grip, and also the automobile involves a halt in only thirty metres.

In fact, thus effective ar the tyres that it takes the Cayenne simply 5 metres additional to prevent than the a lot of lighter Boxster.

What makes winter tyres thus effective?

First, the tread pattern. Winter tyres feature additional “sipes” (or grooves) at intervals the tread blocks (Michelin’s winter tyres feature concerning one,500 sipes, compared with two hundred for a traditional tyre) to supply traction and stability. In snow these sipes truly fill with snow, that then grips to the snow on the road (imagine rolling a snowball) to supply traction. there'll even be a better groove to rubber quantitative relation to assist clear water and scale back aquaplaning.

Winter tyres even have a unique compound, with a high-silica content that means that they keep softer, additional pliable and therefore supply additional grip at low temperatures than summer tyres.

When finding out new rubber, SUV drivers may also encounter Mud and Snow tyres, that ar outlined by TyreSafe as those “whose tread and structure ar designed to convey higher handling than traditional tyres in slush and recent or melting snow”. However, there are not any rules stating that such tyres ought to additionally feature a winter-specific compound, that is thus essential to performance in cold conditions. to make sure that the tyres ar winter-specific, seek for a snowflake or snow-topped mountain image on the sidewall.

When ought to I work winter tyres and the way a lot of can they cost?

Due to their compound, winter tyres inherit their own as presently because the temperature drops below seven degrees C. that's to mention, from late Gregorian calendar month till March you’ll have the benefit of superior acceleration, braking and handling – and therefore safety – if your automobile has winter tyres fitted. That applies on dry, clear roads, and their advantage over summer tyres solely will increase in rain, snow and ice.
http://pricinginsider.carsdirect.com/wp-content/uploads/2011/11/snow-winter-tires-faq-header.jpg
As for value, it depends on the automobile you drive and also the tyre you select to shop for. For the Cayenne we’ve been testing, Associate in Nursing approved wheel and winter tyre package from Porsche prices from £1,600, and for the Boxster from £1,800. Audi sells wheel and tyre packages from £799 (or tyres solely from a really affordable £325), and at this time is throwing in a very year’s margin help if you purchase wheels and tyres.

The other possibility is to supply your own winter rubber, that you’ll be paying concerning £350 and £40-60 for fitting, betting on that tyres you select and wherever you're taking them to be fitted. For the latter, it’s well value phoning around for a number of quotes.

Remember too that the performance of a summer tyre can vary hugely betting on what quantity you pay, and also the same applies to winter rubber.

Other issues

- Last winter the Association of British Insurers printed a winter tyre agreement, stating that insurers wouldn't charge a further premium if customers like better to work winter tyres. As such, there shouldn’t be any associated value with creating the swap, however it’s value a fast courtesy decision to let your nondepository financial institution apprehend.

- It sounds obvious, however contemplate wherever you’re planning to store your existing wheels and tyres. If you don’t have area reception then your main dealer might need house and be happy to store them. usually this can value concerning £10 a month, though some dealers might need special offers (Suzuki is presently charging customers £49.99 for a year).

- keep in mind that winter tyres should be fitted to any or all four wheels. solely fitting them to the driven wheels on a two-wheel-drive automobile can lead to unbalanced handling and braking.

- If you already use winter tyres keep in mind to envision that they need decent tread. The AA advises a minimum of 3mm for winter driving, and no but 2mm.



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