Wheel Offset Question...
Team Owner
Joined: Sep 2003
Posts: 25,393
Likes: 2,741
I generally try to avoid the "converter widgets" out there because if you can't "DO THE MATH" they can't be confirmed. I do the math and rely on that before commenting. The CCW though is a reliable converter, it's what they do!!
I understood your math after you posted it and I often use the "back-spacing" from a wheel/tire combination that is mounted to check clearances. In your examples you just needed to remove from the +offset to move the combination outward. The tread-width by design on the front is less to allow for steering geometry!
Good luck with your wheel search!!
I don't often refer links to "converter widgets" but here's one you will enjoy and maybe can use BUT confirm with "your math"!!!! You can mount your original combination and test "fitment". This one generally passes the "math test" I use!
http://www.rimsntires.com/specs.jsp
Rob,
I meant to ask if you checked the calculations for offset from backspacing using the +1" like I mentioned.
I understood your math after you posted it and I often use the "back-spacing" from a wheel/tire combination that is mounted to check clearances. In your examples you just needed to remove from the +offset to move the combination outward. The tread-width by design on the front is less to allow for steering geometry!
Good luck with your wheel search!!
I don't often refer links to "converter widgets" but here's one you will enjoy and maybe can use BUT confirm with "your math"!!!! You can mount your original combination and test "fitment". This one generally passes the "math test" I use!
http://www.rimsntires.com/specs.jsp
Rob,
I meant to ask if you checked the calculations for offset from backspacing using the +1" like I mentioned.
Last edited by WVZR-1; Mar 27, 2010 at 12:38 AM.
Intermediate
Joined: Nov 2008
Posts: 30
Likes: 0
From: Woburn MA
I have a 95 vette and the stock rear tires are 285/40/17.
Thread Starter
Racer
Joined: Mar 2010
Posts: 291
Likes: 1
From: Temecula Cali
After all that hubub about getting offset right, yours truly just bought a set of speedline magnesium takeoffs with goodyear F1 run flats.
Now instead of worrying about sticking out too far, I have the opposite problem. These bad boys are 17x8.5/60mm and 18x9.5/65mm respectively, and have 245/45-17 and 285/40-18's on them. I think I'm going to need 10mm spacers now just to put me back to stock.
Anyone running spacers with C5 wheels on their C4?
Rob
Now instead of worrying about sticking out too far, I have the opposite problem. These bad boys are 17x8.5/60mm and 18x9.5/65mm respectively, and have 245/45-17 and 285/40-18's on them. I think I'm going to need 10mm spacers now just to put me back to stock.
Anyone running spacers with C5 wheels on their C4?
Rob
