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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Wheels and Tires > wider front tires, on 18x8.5 wheels?
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      10-15-2012, 06:33 PM   #1
Mako
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wider front tires, on 18x8.5 wheels?

So I am looking at a set of rims that are square 18X8.5, since the front wheel will be 0.5 wider than stock, should I put a wider tire on it or stick to 225/45? what would be the benefits of the wider tire and the negatives?

if its a square wheel setup does it make any sense to have the tire size staggered? like 225/45 front and 255/40 rear? Or should I go in-between 235/45 front and 255/40 rear.

The wheels I want only come in 8.5" otherwise I would go with 8" fronts like from the factory.
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      10-15-2012, 06:55 PM   #2
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This is probably the coolest thing in the world, http://www.rimsntires.com/specs.jsp

basically, you can use a 8.5" wheel with the stock 225/45 tires and there will be no noticeable change although the offset will be about 6mm off but your wheel guy should already know this.

I personally don't feel this car should run staggered size tires because I don't think it rotates well enough and would stick with 225 or 255's all the way around (yes you can run 255 on 8.5" according to tirerack for michelin) but 255's have more rolling resistance (marginally less MPG) and probably don't provide any more cornering performance than 225's although someone would have to test it to be absolutely sure.
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      10-15-2012, 07:19 PM   #3
Mako
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Quote:
Originally Posted by brian99997 View Post
This is probably the coolest thing in the world, http://www.rimsntires.com/specs.jsp

basically, you can use a 8.5" wheel with the stock 225/45 tires and there will be no noticeable change although the offset will be about 6mm off but your wheel guy should already know this.

I personally don't feel this car should run staggered size tires because I don't think it rotates well enough and would stick with 225 or 255's all the way around (yes you can run 255 on 8.5" according to tirerack for michelin) but 255's have more rolling resistance (marginally less MPG) and probably don't provide any more cornering performance than 225's although someone would have to test it to be absolutely sure.
thanks, that website explains (shows) it very well.

Last edited by Mako; 10-15-2012 at 07:48 PM.
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