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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 06-09-2013, 03:50 PM
jlsbimmer jlsbimmer is offline
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245/40/18 all around on 330i with sport ?

Hi,

Was wondering if any e90 325i/330i folks (with sport) are runing a square tire setup all around .. and what size they are using ... in particular ..

Using either : 245/40/18 or 235/40/18 ?

I have the oem staggered wheels and want to go with the same tires all around this time. I will obviously have to give up some width on the back to do this.

Opinions or recommendations please ??

thanks all!!

ps - my 330i is a 2006
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  #2  
Old 06-09-2013, 05:12 PM
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floydarogers floydarogers is offline
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225/40 R18 is the correct size. Not sure if that will fit on the rear rims (too wide?)

225/45R18 would be the best non-correct size. That's what my snow tire size is - it corrects the speedo to virtually dead on.
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Old 06-09-2013, 05:15 PM
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bear-avhistory bear-avhistory is offline
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Check the rim width then go to tire rack & see what width wheel the tire can use. Most tires will take a few different wheel widths.
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Old 06-09-2013, 08:16 PM
jlsbimmer jlsbimmer is offline
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Hello,

I have the stock 18 sizes on their now .. staggered of course .. which I want to get away from.

The front rim is 8 inches wide ..and the back being 8.5 inches wide.

Still, I think some folks have put a single non-staggered size on all four .. in that case it would be a compromise to buy 4 tires to fit all four corners reasonably. That's what I'm getting at.

So anyone using 245's or 235's ?
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Old 06-10-2013, 08:28 AM
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floydarogers floydarogers is offline
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Quote:
Originally Posted by jlsbimmer View Post
Hello,

I have the stock 18 sizes on their now .. staggered of course .. which I want to get away from.

The front rim is 8 inches wide ..and the back being 8.5 inches wide.
...

So anyone using 245's or 235's ?
1) 245 and 235 are not going to work in the /40 profile. I've already told you what the workable sizes are in 18".
2) 245 is probably too wide for the front (will rub)
3) google for "tire profile calculator" or go to tirerack.com (already mentioned) to see what is needed.
4) I believe that 225 will work on the 8.5" rears.
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Old 06-11-2013, 10:54 AM
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LMC LMC is offline
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Quote:
Originally Posted by floydarogers View Post
1) 245 and 235 are not going to work in the /40 profile. I've already told you what the workable sizes are in 18".
2) 245 is probably too wide for the front (will rub)
3) google for "tire profile calculator" or go to tirerack.com (already mentioned) to see what is needed.
4) I believe that 225 will work on the 8.5" rears.
I agree on all but one of these points.

I suspect 245/40 is indeed too wide up front. 235/40R-18 is one size larger than stock, but I suspect that it will work without any rubbing or other physical problem. It will change the overall diameter, of course, by a very small amount, effectively changing the gearing -- acceleration will suffer and fuel economy will improve. But in such small measure that I think you would be hard-pressed to tell the difference.

I did this, albeit in 17-inch rather than 18, on my 328iT M sport. I considered 235s all-around but went with 225s on the 8-inch (front) and 8.5-inch (rear) wheels. No problem.
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Last edited by LMC; 06-11-2013 at 10:56 AM.
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