Fitment Question TireSize Upgrade

ImperialBlueBMW · 11-23-2020, 02:45 PM

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...

theEZV · 11-23-2020, 03:22 PM

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.

ImperialBlueBMW · 11-23-2020, 03:31 PM

Quote:

Originally Posted by theEZV

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?

wdeerfield · 11-24-2020, 08:03 AM

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)

ImperialBlueBMW · 11-25-2020, 08:28 PM

Quote:

Originally Posted by wdeerfield

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

ImperialBlueBMW · 12-01-2020, 10:29 PM

Quote:

Originally Posted by ImperialBlueBMW

Quote:

Originally Posted by wdeerfield

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

theEZV · 12-01-2020, 11:37 PM

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.

11-23-2020, 02:45 PM	#1
ImperialBlueBMW New Member 1 Rep 11 Posts Drives: 2014 328i Join Date: Sep 2020 Location: Phoenix, AZ iTrader: (0)	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... Attached Images
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11-23-2020, 03:22 PM	#2
theEZV Lieutenant 178 Rep 462 Posts Drives: F30 335i; Looking for F80 Join Date: Oct 2015 Location: Clarksburg, MD iTrader: (0)	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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11-24-2020, 08:03 AM	#4
wdeerfield A family of bimmers 2745 Rep 7,741 Posts Drives: '18 G01 X3M40i Join Date: Jan 2012 Location: Clifton Park, NY iTrader: (0)	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) __________________ 2018 PB/Black G01 X3M40i \| 699M \| ZDA \| ZPP \| ZPX \| Maxton front lip \| X3M vents \| 15mm Spacers \| Diamond G20 style grills
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12-01-2020, 11:37 PM	#7
theEZV Lieutenant 178 Rep 462 Posts Drives: F30 335i; Looking for F80 Join Date: Oct 2015 Location: Clarksburg, MD iTrader: (0)	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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