Getiing Dunlop Direzza SS for autocross, what size?

Oofie · 05-04-2011, 10:51 AM

My brother and I will be getting a new set of tires for his 135i. They will be mounted on Kosei 17x8.5 et 40. We're choosing between 235/45/17 and 235/40/17 both Dunlop Direzza SS.

Any good reason to choose one set over the other? The 45 series will be cheaper by $28 for all four, so it really isnt a deciding factor.

By the way, this will be on a stock car, so 235 is the widest we can go.

Eddy@ApexWheels · 05-04-2011, 02:05 PM

235/40/17 is the correct size.

45 has a tall sidewall and it will flex a lot more. the 40 sidewall will be better for gearing on an autocross course as well. The only time 45 sidewalls are used on 17's in that width are on a 5 series

Oofie · 05-04-2011, 02:09 PM

Quote:

Originally Posted by paintpro21

235/40/17 is the correct size.

45 has a tall sidewall and it will flex a lot more. the 40 sidewall will be better for gearing on an autocross course as well. The only time 45 sidewalls are used on 17's is on a 5 series

Thank you very much! If my brother decides to "mod" his car, we'll surely be in touch for those ARC-8 wheels...hmmm 255s and 275s

05-04-2011, 10:51 AM	#1
Oofie Private First Class 16 Rep 127 Posts Drives: 13 FR-S Join Date: Jul 2005 Location: SF, CA iTrader: (0)	Getiing Dunlop Direzza SS for autocross, what size? My brother and I will be getting a new set of tires for his 135i. They will be mounted on Kosei 17x8.5 et 40. We're choosing between 235/45/17 and 235/40/17 both Dunlop Direzza SS. Any good reason to choose one set over the other? The 45 series will be cheaper by $28 for all four, so it really isnt a deciding factor. By the way, this will be on a stock car, so 235 is the widest we can go.
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05-04-2011, 02:05 PM	#2
Eddy@ApexWheels 444 Rep 1,658 Posts Drives: E30 M3, F10 M5 Join Date: Jun 2009 Location: Bay Area, CA iTrader: (6)	235/40/17 is the correct size. 45 has a tall sidewall and it will flex a lot more. the 40 sidewall will be better for gearing on an autocross course as well. The only time 45 sidewalls are used on 17's in that width are on a 5 series __________________ 925-245-0773 /// info@apexraceparts.com Wheels /// Accessories /// Vehicle-Specific Fitment Guides Last edited by Eddy@ApexWheels; 05-04-2011 at 02:28 PM..
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