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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Wheels and Tires -- Sponsored by The Tire Rack > Fitment Question TireSize Upgrade
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      11-23-2020, 03:45 PM   #1
ImperialBlueBMW
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Current 17x7.5 225/50r17 squared.

Upgrade? 18 x 8.5 225/40/18 offset 30 Front
18 x 9.5 265/35r18 offset 35 Back

Would this work? TireSize told me it adds 1.5" width to the back. 0.67" width to the inside. Is this too close to frame/suspension? Pics attached...

edit: I am buying 3rd party lightly used so can't really change to oem spec...
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      11-23-2020, 04:22 PM   #2
theEZV
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Why are you not going with the stock sizes for 18s? (225/45 and 255/40) Wheel size/offsets are fine/very common for these cars.
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      11-23-2020, 04:31 PM   #3
ImperialBlueBMW
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Quote:
Originally Posted by theEZV View Post
Why are you not going with the stock sizes for 18s? (225/45 and 255/40) Wheel size/offsets are fine/very common for these cars.
I am buying 3rd party lightly used. I'll include that in post. Not really an option to change tire sizes. Any issues?
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      11-24-2020, 09:03 AM   #4
wdeerfield
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are you Xdrive? if so you'll want to keep the front and rear circumferences within 1%. a better setup for 8.5 and 9.5 wide wheels would be a 235/45/18 and 265/40/18 (unless you are lowered)
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      11-25-2020, 09:28 PM   #5
ImperialBlueBMW
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Quote:
Originally Posted by wdeerfield View Post
are you Xdrive? if so you'll want to keep the front and rear circumferences within 1%. a better setup for 8.5 and 9.5 wide wheels would be a 235/45/18 and 265/40/18 (unless you are lowered)
not xdrive. base model no upgrades yet
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      12-01-2020, 11:29 PM   #6
ImperialBlueBMW
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Quote:
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Quote:
Originally Posted by wdeerfield View Post
are you Xdrive? if so you'll want to keep the front and rear circumferences within 1%. a better setup for 8.5 and 9.5 wide wheels would be a 235/45/18 and 265/40/18 (unless you are lowered)
not xdrive. base model no upgrades yet
hello
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      12-02-2020, 12:37 AM   #7
theEZV
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It'll work, the speedo may be a bit off most likely. Nothing to be concerned about from a technical perspective as long as you're RWD.
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