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E90/E91/E92/E93 (2006 - 2013)
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Old 08-25-2014, 03:51 PM
jimz591 jimz591 is offline
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Confused tire size.

Hi everyone - I have a question about my pre-owned 2011 328i with 17 inch rims. I need to get new tires but when I look on most tire web sites the tire size's are staggered Front 225/45/17 Rear 255/40/17 but the thing is when I physically look at the tire size on my 328 they are both 225/45/17 front\back. Do I stick with the OEM size or get the staggered size?
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Old 08-25-2014, 04:43 PM
wilt wilt is offline
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with 17" x 8" wheels all around take 225/45-17 tires on all four
with 17" x 8.5" rear wheels take 255/40-17 tires on the rear
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Old 08-25-2014, 05:14 PM
jimz591 jimz591 is offline
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How would I find out if the rears are 8.5''or 8''?
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Old 08-25-2014, 05:16 PM
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Nordic_Kat Nordic_Kat is offline
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I am presuming your 328i doesn't have the sport package, which means it has a square set up. The staggered setup is exclusive to the sport package. The Sport package is most recognizable by the seats with extra large bolsters and the thigh support.
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Last edited by Nordic_Kat; 08-25-2014 at 05:17 PM.
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Old 08-25-2014, 05:19 PM
jimz591 jimz591 is offline
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Ok thanks, what is I replaced the OEM rims with 18" staggered will that mess with my speedometer
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Old 08-25-2014, 09:03 PM
wilt wilt is offline
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Quote:
Originally Posted by jimz591 View Post
Ok thanks, what is I replaced the OEM rims with 18" staggered will that mess with my speedometer
Some of the online tire sales places offer specifications for revolutions per mile for different sizes/brands of tires. Generally 225/45 has similar rotational figures for 255/40. For example. Tire Rack shows Bridgestone Potenza 225/45-17 at 833 revs/mile while 255/40-17 is 835 revs/mile

Your size selection issue is whether or not 255 width tire is too wide on 8" wheel!

Last edited by wilt; 08-25-2014 at 09:30 PM.
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Old 08-26-2014, 03:37 AM
NigelUSA NigelUSA is offline
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Quote:
Originally Posted by wilt View Post
Some of the online tire sales places offer specifications for revolutions per mile for different sizes/brands of tires. Generally 225/45 has similar rotational figures for 255/40. For example. Tire Rack shows Bridgestone Potenza 225/45-17 at 833 revs/mile while 255/40-17 is 835 revs/mile

Your size selection issue is whether or not 255 width tire is too wide on 8" wheel!
As Wilt says, it will depend on your Revs/mile - you should try to match as close as possible (within 2%). Unfortunately not all tires are measured the same way so you may also need to note the wheel width used to measure the tire - some 255s will be measured on 8.5 some on 9, etc..

The staff at Turner Motorsport are very helpful as they've figured out all the wheel options. If you are upgrading your wheels and planning on using aftermarket wheels be sure your offsets are correct. They have a good selection of wheels too. (I just purchased some new ones for my E85).
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Old 08-26-2014, 08:18 AM
jimz591 jimz591 is offline
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Thanks guys, very informative. If I upgraded to 18" wheels with RFTs as I don't have a Spare would It be a harder ride?
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Old 08-26-2014, 09:55 AM
wilt wilt is offline
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Originally Posted by jimz591 View Post
Thanks guys, very informative. If I upgraded to 18" wheels with RFTs as I don't have a Spare would It be a harder ride?
Shorter sidewalls with 18" wheels than with 17" wheels. Shorter sidewalls on RFT = stiffer
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