wheel weight ?

[T2Andy]

Does any one know the approx weight of a 18 in s8 wheel and tyre .I want to compare
against the new OZ superleggara ultras ,ithink there may be about 5kg differance .
Has any one felt any differance when changing to a lighter wheel .

[philS2]

when i changed to a heavier wheel it was like having two extra people in.they are approx.6kg heavier,so i would expect it to accelerate a lot quicker.although i did go up in diameter as well.

[T2Andy]

thats what mine felt like .not good .

[dan_b]

Don't forget also that a wider tyre gives more friction on the road, increasing drag!

[Keeper of The Kitten]

And wider tyres will also present a bigger aero drag.

But balance that with increased traction at the acceleration stage.

Trade that against a lower ground pressure.

But our cars are heavy so that won't be an issue.

Lots of different effects produced by a few causes! For sure the increased weight will be a big deal, considering the inertial effects of a spinning disc. Use bigger wheels wisely - to facilitate bigger brakes - and choose carefully with weight uppermost in mind, but consider the durability and strength of the wheel as well!

__MDC__

[Ski]

when i changed to a heavier wheel it was like having two extra people in.they are approx.6kg heavier,so i would expect it to accelerate a lot quicker.although i did go up in diameter as well.

Do wheels make such a difference as the weight is not actually on the shocks n other related parts.. ?

[Keeper of The Kitten]

Yes - it is all weight that needs to be accelerated forwards.

Worse than that, it needs to be rotated as well - and that starts the inertia effects that make the wheel more difficult to "yaw" (as in, steering the car through a corner).

Any additional weight in the rotating wheels is a problem, but if you want to fit bigger brakes and stiffer tyres, you have to fit bigger wheels!

__MDC__

[Keeper of The Kitten]

BTW remember that inertia effects apply to all objects - car standing still doesn't want to move until you make it move, by applying power that overcomes the inertia.

Similarly when it is going in a straight line, it doesn't want to stop or turn a corner unless you apply forces that overcome the tendency to move in a straight line.

__MDC__

[philS2]

Do wheels make such a difference as the weight is not actually on the shocks n other related parts.. ?

lets put it this way-i'd much rather have another 24 kilos in my car than on the wheels.E.g. i took my spare out (about 20kilos) but i didn't think 'wow that loads faster'.but putting the wheels on i thought 'has someone hooked a frickin' caravan to me s2?' it really was that noticable.when i drive normal it takes so much more effort to get the car going that the dump valve is a lot louder.i think if you're looking for a light weight wheel rs6 reps,at least,are not the way to go.posibly that's partly why they're so cheap.because they're made more solidly due to lack of quality materials(compared to an original rs6 wheel).then again you watch,some will say 'they're the same weight',and i'll look a knob.

[ctolladay]

The less un-sprung weight the better. The lighter the wheel-tire combo the better as the thing that lets you corner is the contact that the tire has with the road. If you hit a bump the wheel is forced upwards, the heavier the wheel the more the wheel moves upwards, the less contact preasure you have with the road. Light wheels = better handling = better aceleration = bigger smile. Nuff said!

[T2Andy]

Will have to make some weight comparrisons i will phone the tyre centre to get some weights.

[T2Andy]

The OZ superleggaras ultras are one of lightest wheel on the market at the moment.

[Mark Halligan]

http://www.wheelweights.net/

http://www.wheelspecs.com/specs/

[T2Andy]

Nice one mark cheers.

[Skull]

one 17" 215/45 tire weights 10kg btw

how much weights a 8x17" ultraleggera?