Smaller diameter wheels in back?

AshwinLB · 07-17-2023, 09:45 AM

Recently I’ve learned about how more sidewall can affect your straight-line grip more than wider widths? It would be been nice to learn this before installing 370mm M-Performance calipers and rotors on my 135i so I just could run a 17” set all around lol

Anyhow, I wanted to get some feedback on if anyone has run a setup with 18” wheels in the front and 17” wheels on the back for street and track use? I know this is done on the drag strip but I wanted to know if this would bring any negative effects in regards to handling?

I’m thinking of doing 235/40R18 in the front and 255/40R17 in the back. The overall diameter is slightly smaller in the back but i think it would be fine since it’s not x-drive?

Currently running the standard apex 235/40R18 front and 265/35R18 rear.

Tell me why I shouldn’t be considering this lol (except because of the look)

bnace10 · 07-19-2023, 02:22 PM

You get more sidewall "roll", which is not good for handling.

07-17-2023, 09:45 AM	#1
AshwinLB Private 47 Rep 95 Posts Drives: 2008 BMW 135i 6MT Join Date: Jan 2018 Location: Toronto iTrader: (0)	Smaller diameter wheels in back? Recently I’ve learned about how more sidewall can affect your straight-line grip more than wider widths? It would be been nice to learn this before installing 370mm M-Performance calipers and rotors on my 135i so I just could run a 17” set all around lol Anyhow, I wanted to get some feedback on if anyone has run a setup with 18” wheels in the front and 17” wheels on the back for street and track use? I know this is done on the drag strip but I wanted to know if this would bring any negative effects in regards to handling? I’m thinking of doing 235/40R18 in the front and 255/40R17 in the back. The overall diameter is slightly smaller in the back but i think it would be fine since it’s not x-drive? Currently running the standard apex 235/40R18 front and 265/35R18 rear. Tell me why I shouldn’t be considering this lol (except because of the look)
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07-19-2023, 02:22 PM	#2
bnace10 Second Lieutenant 145 Rep 219 Posts Drives: 2011 E82 135i DCT Lemans Blue Join Date: Jul 2020 Location: South Central PA iTrader: (0)	You get more sidewall "roll", which is not good for handling.
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