600whp S4

And what would be the best offset....


Thanks

DRBC43AMG

Check this chart: Alloy Wheels Direct Ltd

AndreNY

you can do 9 or 9x5 front and 11" in the rear if you stretch the tire

503C43 ////AMG

Stretched tires = less contact patch which defeats the whole performance purpose of going wide

now if you are going for a certain look then yes, go ahead and stretch, but if you are looking for more traction, do not stretch

John-in-Dallas

What sizes if he wants to drive the car?

AndreNY

215/40 front and 245/35 rear

503C43 ////AMG

8.5 in the front and 9.5 in the rear should work out as long as he has the right offsets

jumph4x

Don't listen to him. Contact patch is a function of PSI, not tire dimensions. Tire dimension changes at a constant PSI do form a different contact patch shape, but not area. The shape has negligible performance benefits.

Performance effects of stretching tire are twofold:

• wheels are larger than necessary: more rotating unspring weight
• simulation of stiffer sidewalls

AndreNY

i think the main question to this thread was, "whats the widest wheel he can get front and back" and 8.5" and 9.5" is def not the answer

503C43 ////AMG

So what you are saying is:
Contact patch is a function of PSI, not tire dimensions = So a 6" tire can have the same contact patch as a 12" tire simply by adjusting PSI?? If not then tire dimensions would play a role in the size of a contact patch

I understand that less PSI would give you more contact patch but there is a limit due to the fact that you can only run yur PSI so low before seperating plys and getting bubbles in the side wall or even worse damaging a rim.

I am not an expert on stretched tires but I would imagine that you can't go as low in regard to PSI due to possibly losing the bead and getting a flat, I could be wrong...

ECTurboGSX

You can actually get a pretty good estimate of the weight of a vehicle if you measure the contact patch and the inflation pressure. Just pounds/square inch time square inches leaves you with pounds. However, tire width does obviously play a role in handling.

600whp S4

I want to stance the car. but i dont want to much poke so im thinking 9.5 in the front and 10.5 in the rear.

AndreNY

18x9.5 front and 18x11.5 rear

600whp S4

so 9.5 front and 10.5 rear should be perfect maybe ill do 10 in the rear so i can put them on my s4