Hello, i just put a 6" lift with some 35x12.50 15's on it, and it rubs on my radius arm at about one and a half wheel turn.

I know my options are to get wheel spacers, different rims or extended radius arms to fix this issue.

I need some opinions on what kind of rim/backspacing i need to purchase, or if i should just get some extended radius arms. Thank you for taking the time to read this post, i know it's a lot

Edit: 96 f150 4x4

 

From what i understand i think you need a 4in backspacing or more. Someone with more experience will chime in soon

 

More than 4"? or less than 4"? Backspacing has me all backwards and inside out.

 

Try this website. http://www.willtheyfit.com/ will give you am idea of what you need. Input your set up now. And what you are looking at. If I'm not mistaken i would be 4 and lower.

 

What wheels are those tires on currently? You need something with less backspacing than stock.. not more.

 

So if the wheels in the stock wheel you will need something with a negative back spacing or negative offset. That will push your wheel further out of the wheel well and away from your radius arm

 

Falken rocky mountain ats, 35x12.50 15

I can't find anything with less than 3.625 backspacing, which i know is not enough.

Edit: Stock steel rims from the factory (Man i love the look!)

 

Throw some spacers on there till you can get different wheels

 

Negative offset, yes. That means that the mounting surface is closer to the inner bead than to the outser bead, so it moves the center of the tire out from the mounting surface.

Negative back spacing? No. That would mean the inner bead of the tire is outboard from the mounting surface. That would look... odd.

To the OP, If your stock tires were 235s, they were 9.25" wide. Going up to 12.5" wide tires on the same rims moves the inner edge of the tire about 1 5/8" in. My understanding is that factiory rims on these trucks were zero offset, so to move the inner edge of the tire to the original location you'd need about 1 5/8" negative offset. I've been told that offset is speced in mm, so that would be about -41 mm offset.

 

The only problem with that, is the only thing close to -41mm is -38mm on a 15x10. Not sure if that's going to help too much. I did find a website with extended radius arms for $490 after tax.

I would use wheel spacers, except I only have about 1 1/2" to play with before the hubcaps stick out further than the locking hubs.