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Tyre Issue?


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#11
vr2turbo

Posted 19 December 2006 - 05:48 PM

vr2turbo

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cucuk,

Correct to a point, but not only engine power.
What about slowing down fast from high speed, or emergency stop, traction
is required.

"i think if the weight acting on the tyre remain constant, increasing the
width of the tyre wud not really increase the contact patch cos how much
contact has on that surface also depend on pressure acting on it"

Again you are correct to a point.
If you are talking about a Wira/Waja with 225/40/R17 or 235/40/R18, then
the contact patch may not be that great even with wide tyres to that size,
but if on 195 to 215 size, contact patch is pretty good.
That is why I say to a point, you cannot overdo it.

rdgs,

#12
cucuk

Posted 26 December 2006 - 09:31 AM

cucuk

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then i guess increasing the width by 20mm to 40mm shud be quite ok, then
the next issue to consider is whether the width wud graze the fender and
whether it is advisable to use spacer in return for a wider tyre?

#13
vr2turbo

Posted 26 December 2006 - 07:02 PM

vr2turbo

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cucuk,

Try not to use spacers. If really required, maybe 1/4 inch only.

May have Balancing, alignment and also wheel bearing problems.

rdgs,

#14
cucuk

Posted 27 December 2006 - 09:13 AM

cucuk

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based on your above response, i suppose we shud also stick to the factory
spec. rim offset or the similar implication may happen cos we can also
use rim wif different offset to fit wider tyres instead of using spacers

on the question on traction again, do think the tyre will achieve better
traction and wider contact patch by reducing tyre pressure, i get various
opinion on this

#15
vr2turbo

Posted 28 December 2006 - 02:19 AM

vr2turbo

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cucuk,

Slight change in offset is allowed, as long as the wheels do not stick out
of the wheel arch. Rims with larger offset and rims with smaller offset
plus spacers are two different thing.

The best air pressure is still the correct air pressure.
If you reduce the air pressure too much, your centre contact patch will suffer.
If this happens, you get less contact, your cornering stability will
suffer, your tyres will run at higher temperature and on wet patches, you
will then to aquaplan (cannot cut thru' the water).

If air pressure is too high, contact patch is also less, and that means
less traction. (I think this is what you mean), but however, cutting thru'
water is good. cornering is better then less air pressure, but
ride(comfort) is bad.

rdgs,