bobbyc Posted April 1, 2008 Share Posted April 1, 2008 so a wheel with that is 8" wide with a 4" bs is a wheel with a -12mm offset? Quote Link to comment Share on other sites More sharing options...
Kevin.pk Posted April 1, 2008 Share Posted April 1, 2008 yep that should be right Quote Link to comment Share on other sites More sharing options...
bobbyc Posted April 1, 2008 Author Share Posted April 1, 2008 wierd...i'd think a 0 offset since it's in the middle...but good to know...thanks! Quote Link to comment Share on other sites More sharing options...
jt1 Posted April 1, 2008 Share Posted April 1, 2008 Backspace is measured from the outer lip of the wheel, not the inner lip where the tire bead sits. jt Quote Link to comment Share on other sites More sharing options...
hughdogz Posted April 1, 2008 Share Posted April 1, 2008 wierd...i'd think a 0 offset since it's in the middle...but good to know...thanks! It's not in the middle since an 8" rim is 8" from inside to inside, where the tire mounts. But overall width is 9" when you include the thicknesses of the mounting lip (outside to outside). (8"+1")/2 = 4.5 inches, this is the centerline of the wheel (going from the outside). It it was zero offset, then the backspace would be 4.5 inches. Since they are -12 offset, the mounting face is inward 12mm (~1/2") from the centerline. That is how it is 4" backspacing. I hope this helped... Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted April 1, 2008 Share Posted April 1, 2008 hughdogz got it right. I wrote these calculators a while back. Try #1 and #2: http://www.autolounge.net/calculators/tirespacing.html The third calculator is only for tire setups where the section width sticks past the lips of the wheel. Quote Link to comment Share on other sites More sharing options...
hughdogz Posted April 1, 2008 Share Posted April 1, 2008 Holy ****! That site you made is AWESOME Chris. I'm going to have to do some serious reading tonight...Thanks! Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted April 1, 2008 Share Posted April 1, 2008 Holy ****! That site you made is AWESOME Chris. I'm going to have to do some serious reading tonight...Thanks! Thanks! I spent a ton of time compiling the specifications sheet, but got burned out on it and haven't really analyzed the data much. I think my favorite one was the understanding horsepower bit where I actually finally realized the value of horsepower under the curve and how it relates to displacement. Quote Link to comment Share on other sites More sharing options...
DavyZ Posted April 2, 2008 Share Posted April 2, 2008 Wow, I had no idea you did all that. NICE page and extremely useful too Davy Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.