tyre size

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    Danzul
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    tyre size

    Post  Danzul on Wed Jul 28, 2010 9:08 am

    this is more for the performance side of things rather than the show side.

    its a given that the majority of people will choose a small profile tyre for there car for better handling. however, surely a larger profile tyre would be better as when really pushing car car on track round a corner the tyre is less stiff allowing you to use the tyre wall, rather than just running out of grip and sliding on a lower profile trye...?
    if that is not the case then why do the formula one cars and rally cars and BTCC cars use a large profile tyre...?


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    psbarham
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    Re: tyre size

    Post  psbarham on Wed Jul 28, 2010 2:50 pm

    Danzul wrote:this is more for the performance side of things rather than the show side.

    its a given that the majority of people will choose a small profile tyre for there car for better handling. however, surely a larger profile tyre would be better as when really pushing car car on track round a corner the tyre is less stiff allowing you to use the tyre wall, rather than just running out of grip and sliding on a lower profile trye...?
    if that is not the case then why do the formula one cars and rally cars and BTCC cars use a large profile tyre...?

    It all comes down to balance, lower profile tyres give more feedback due to the lack of flex, but the suspension has to do more work to absorb the bumps as there is less tyre wall to flex, also the wheels will be heavy which affects the handling by increasing the unsprung weight of the vehicle so the suspension has to work harder to keep the wheels on the ground.

    the reason things like F1 and touring cars use relatively high profile tyres is down to 2 things,
    1) rules, they have a maximum rim size, 13" in F1 and 17" in touring cars
    2) unsprung weight, which weighs more a metal circle or a big void full of wind? lighter wheel tyre combos mean the unsprung weight is lower so all the suspension components can be lighter which means they contribute less to the overall vehicle weight, thus making the car lighter, which makes it faster and so on.

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