tire sizes - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Speedfreak · 02-27-2003, 09:48 AM

Will a 235/40/17 fit on a 17x7 inch rim?

Tubed4evr · 02-27-2003, 10:23 AM

I know it will fit on a 7.5in wide rim check it out. Look at the 2nd paragraph below the chart. So if BMW thinks it's good enough to run on the M3 then it should be just fine on my wheels. I think I just found my next tire size

orange-grey · 02-27-2003, 09:19 PM

Even if it does fit, that doesn't mean you should try. When you mount a wider tire on a skinnier wheel it causes the sidewalls to fold inward towards the bead. When you throw the car into a corner, the tire has to actually move laterally on the wheel before the outer sidewall begins to stretch and transfer the "grip" from the contact patch to the wheel and then the suspension. This makes the car feel unresponsive and sloppy. If you run a skinny tire like a 195 (i.e. "drift style") the sidewalls are effectively pre-streched so response is insanely immediate, but grip is ultimately compromised with the skinnier tire. A good compromise would be a 215/45, which would give a good balance of grip and response. And if you're worried about drag racing, I would think more about getting a soft tire compound since you're effectively only running on the inner half of the tire anyway.

02-27-2003, 09:48 AM	#1
Speedfreak Leaky Injector Join Date: Feb 2003 Location: Alaska Age: 52 Posts: 58 Trader Rating: (0) Feedback Score: 0 reviews	tire sizes Will a 235/40/17 fit on a 17x7 inch rim?

02-27-2003, 10:23 AM	#2
Tubed4evr Zilvia Member Join Date: Aug 2002 Location: Virginia Tech / Chesapeake, VA Posts: 223 Trader Rating: (0) Feedback Score: 0 reviews	I know it will fit on a 7.5in wide rim check it out. Look at the 2nd paragraph below the chart. So if BMW thinks it's good enough to run on the M3 then it should be just fine on my wheels. I think I just found my next tire size Last edited by Tubed4evr; 02-27-2003 at 10:28 AM..

02-27-2003, 09:19 PM	#3
orange-grey Leaky Injector Join Date: Aug 2002 Posts: 94 Trader Rating: (0) Feedback Score: 0 reviews	Even if it does fit, that doesn't mean you should try. When you mount a wider tire on a skinnier wheel it causes the sidewalls to fold inward towards the bead. When you throw the car into a corner, the tire has to actually move laterally on the wheel before the outer sidewall begins to stretch and transfer the "grip" from the contact patch to the wheel and then the suspension. This makes the car feel unresponsive and sloppy. If you run a skinny tire like a 195 (i.e. "drift style") the sidewalls are effectively pre-streched so response is insanely immediate, but grip is ultimately compromised with the skinnier tire. A good compromise would be a 215/45, which would give a good balance of grip and response. And if you're worried about drag racing, I would think more about getting a soft tire compound since you're effectively only running on the inner half of the tire anyway.