Calgary Jeep Association

4x4 Related Groups => Tech Talk => Topic started by: 4Banger_madness on February 28, 2008, 01:01:04 PM

Title: backspace
Post by: 4Banger_madness on February 28, 2008, 01:01:04 PM

what kind of backspacing do i need to run 33X12.5 tires on my 1988 YJ

thanks nich

Title: Re: backspace
Post by: BlackYJ on February 28, 2008, 02:40:51 PM

If you want to minimize rubbing you will need about 3.75" on a 8" rim

Title: Re: backspace
Post by: 4Banger_madness on February 28, 2008, 10:21:04 PM

ok hows about a 35" tire and would i have to change gears?

Title: Re: backspace
Post by: BlackYJ on February 29, 2008, 07:11:03 AM

Quote from: 4Banger_madness on February 28, 2008, 10:21:04 PM

ok hows about a 35" tire and would i have to change gears?

backspacing really does not have anything to do with tire diameter, it is width.  With my 33x12.5s and 3.75" BS, I still rub slightly at full lock.

As for 35s and gears, it all depends on what you got now.  However, as a rule of thumb, you should have at least 4.56s for 35s.  Nowadays a lot of people are going with 4.88s.  On the flip side though, I know people running 35s with 4.10s and 3.73s.