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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > Tire size issue?



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      05-10-2021, 07:59 AM   #1
michaelalex17
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Hi all I am looking to buy a set of style 193m wheels. The factory tire sizes are:

225/40/18
255/35/18

I found a set online for sale with the following setup:

225/45/18
255/35/18


Apologize for the dumb question but will this cause an issue? Speedo? Transfer case?

Thanks!
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      05-10-2021, 12:22 PM   #2
Yotaismygame
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Ill give you a hint

https://tiresize.com/calculator/
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      05-10-2021, 05:13 PM   #3
michaelalex17
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Thanks. I just ran a comparison for the two tire setups. There's obviously a difference, but I don't know what's considered within spec or not. I don't really care about the Speedo difference, but I would care if it negatively impacts handling and or can mess up the transfer case.
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      05-11-2021, 10:48 AM   #4
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On this forum it's been stated many times there should not be a difference of more than 1% in diameter front to back for AWD vehicles.
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      05-11-2021, 11:02 AM   #5
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Quote:
Originally Posted by michaelalex17 View Post
Thanks. I just ran a comparison for the two tire setups. There's obviously a difference, but I don't know what's considered within spec or not. I don't really care about the Speedo difference, but I would care if it negatively impacts handling and or can mess up the transfer case.
Those calculations are not correct as you show. A 255/35/18 is 25.0in and 0.4% smaller than a 225/40/18. But to answer your original question, the front tires are to tall to work with AWD.
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