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Optimum geometry for winter tyres....


CumbrianFoz
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The tyre compound won't make any difference to the geometry, you can even set this without the wheels on the car if the machine allows. I run winter tyres and have never had the geometry changed for them and summer tyres.

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Good question...

The area that should be taken into consideration is gaining tyre temperature as fast as possible and that would be the front/ rear toe angle. Toe's footprint is lateral scrub so like rubbing your hands together... Here in the UK we tend to have a few days of sludge so simply keeping the speed down would benefit more than any geometric changes.... One other point is to lower the tyre pressure by a few PSI.

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My thinking was that on surfaces with less friction all the normal considerations of camber etc. will not really apply so much since you'll be sliding before you get much roll and deformation of the tyre.

Up here we sometimes get rather longer periods of cold weather, and a bit of snow on the mountain roads is not unusual even with the mild, wet crap winters of the last few years. Your point about tyre temperature is a good one, might be worth looking for some tyres with a poorer rolling resistance rating maybe? 

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You're correct that the camber, castor and alike are just a passengers during winter weather. Rolling resistance and toe are partners since both add heat to the tyre which in turn softens the silica = grip add to this under-inflation to gain a bigger contact patch then you're done unless you use chains.

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