Tire size help

rgatt45 · 03-10-2026, 11:27 PM

Looking for some input here. Is running a 245/35/18 in the front and 255/35/18 in the rear doable. On tire calculator it says the diameter difference is +.8 is that safe to run on x drive with x delete ? Fairly new to the platform so any input helps. Thanks in advanced. (09 335xi)

TunafishE93 · 03-11-2026, 04:18 AM

You will be fine, they are actually smaller than stock so no clearance issues and a 2% difference is not going to throw any errors.
The 245/35 is a more expensive size and will have a worse ride quality.

Three_thirty_I · 03-11-2026, 07:42 AM

It's so negligible, so won't be a problem!

Fun fact, on the E46 M Sport wheel setup, the rear width is 245 instead of 255, front is still 225 which is the same as the E90.

rgatt45 · 03-11-2026, 07:48 AM

Thanks guys appreciate it !

03-10-2026, 11:27 PM	#1
rgatt45 Registered 2 Rep 2 Posts Drives: 2009 335xi Join Date: Mar 2026 Location: New York iTrader: (0)	Tire size help Looking for some input here. Is running a 245/35/18 in the front and 255/35/18 in the rear doable. On tire calculator it says the diameter difference is +.8 is that safe to run on x drive with x delete ? Fairly new to the platform so any input helps. Thanks in advanced. (09 335xi) Last edited by rgatt45; 03-11-2026 at 07:26 AM..
	Appreciate 0 Tweet Quote

03-11-2026, 04:18 AM	#2
TunafishE93 Major 561 Rep 1,309 Posts Drives: BMW 335i Join Date: Dec 2019 Location: NV iTrader: (0)	You will be fine, they are actually smaller than stock so no clearance issues and a 2% difference is not going to throw any errors. The 245/35 is a more expensive size and will have a worse ride quality.
	Appreciate 1 rgatt451.50 Quote

03-11-2026, 07:42 AM	#3
Three_thirty_I Colonel 606 Rep 2,072 Posts Drives: 2010 BMW E90 330i M Sport Join Date: Aug 2010 Location: Cape Town, South Africa iTrader: (0) Garage List 2010 BMW E90 330i M ... [9.63]	It's so negligible, so won't be a problem! Fun fact, on the E46 M Sport wheel setup, the rear width is 245 instead of 255, front is still 225 which is the same as the E90. __________________ 2010 BMW E90 330i M Sport (M) Ex: BMW E90 330i (M) '05 (His) \| (Hers) BMW E46 320i f/l (M) '03
	Appreciate 1 rgatt451.50 Quote

03-11-2026, 07:48 AM	#4
rgatt45 Registered 2 Rep 2 Posts Drives: 2009 335xi Join Date: Mar 2026 Location: New York iTrader: (0)	Thanks guys appreciate it !
	Appreciate 1 Three_thirty_I606.00 Quote