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#21
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#22
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"Badger" > wrote:
... >Personally, I doubt that snow tyres alone can give you the same grip and >acceleration as in the summer, a bit of journalistic exaggeration there >methinks. They will undoubtedly give more grip than a summer type tread >pattern would in the snow though. the difference between a summer tyre and a proper snow tyre (not M+S) on snow is very significant in practice. much more than ever could be deducted by looking at the tyre patterns - the rubber compound is quite different too. of course an emergency braking will never be the same on snow, but for normal driving the difference can be quite small. and that is the potentially dangerous bit. >>> >> So why is it that the car can accelerate *quicker* than it can brake? >> >All things being equal Rob, it can't. The grip required to accelerate a body >is the same to decelerate it. Mr Newton once said "a body in motion shall >remain so unless acted upon by an external force", the same applies to a >body at rest. In theory, air resistance should help it to slow at a greater >rate than it accelerated, but it's such a small effect at sensible snowy >weather roadspeeds that it's not really worth considering. >What is an issue however, is the tread of the snow tyres. Some are >directional, giving more bite when accelerating than braking. Personally, if >it weren't for the silly laws in britain I'd fit them backwards so that the >braking grip was better. >Badger. > > |
#23
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"Oldun" > wrote:
>Could it be that BMW say do not use snow chains because of possible damage >to the car. With limited clearance between the wheel and the underside of >the wheel arch, the extra dimension could be critical at maximum spring >compression. Particularly when the front wheels are on full lock. that'd make sense. I'm pretty certain that there's not much extra room between the wheel and the surroundings even without silly 18'' wheels. >Just a thought. > >Oldun > > |
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