how much back spacing would be recommed to run 12.50" wide tires on a 02 f250
i am not sure on the stock back spacing

 

I don't know how much your truck is lifted but when I put new tires and wheels on my 4" lifted 2002 F350 SRW 4x4 CC SB, I bought Eagle Alloys Series 114 in 17x10, 4.65" backspacing, -20mm offset. I put 35x12.50/17 Super Swamper Truxus tires on. The tires and wheels fit perfectly within my fenders and I had no rubbing issues even at full turn. Look for wheels with similar specs as mine or 4.5" backspacing with -24mm offset.

 

That's weird. I have 4.5" backspacing on my 17x8.5" Welds and I get rubbing on the spring at full lock. 35x12.5x17 BFG MT KM2s. Just goes to show that each truck is different.

 

Thats because you have a 1.5" narrower rim with same back space so the centre line of your tyre tread (yes I know Tire) and the inner edge is 3/4" nearer the spring.

 

I see what your thinking but I'm not sure I totally buy that.

Seems a narrower rim would pull the sidewall in more than a wider rim. Plus...his is 4.65" backspace so technically .60" nearer the spring. Just messing with you.

Also, mine only rubs on the passenger side spring. Could be my axle is not perfectly centered, but it tracks perfectly straight.

 

diff between 4.5 and 4.65 is only 0.15. side wall nearest the rim would be further in but the corner of the running tread would be simmilar.

 

my truck has no lift i want to run 16x10 rims

 

bump anybody

 

bump anybody

 

I have the plow package, so essentially levelled, with 16x10, 4" backspacing, -38 offset and 305's. It's nowhere close to rubbing the springs, but had to trim the bottom of the bumper and pull back the fender liners a little. With a lower truck I think you'll need more backspacing to stay away from the sheetmetal, but then add in the wider tires and you might be into the springs.

 

i am not worry about the sheetmetal at all thats what grinders are for im just worry about hiting the springs the rims i am lookin at are Mickey Thompson Classic Lock 16x10 4.25 backspacing -32 33x12.50 tires

 

You should be more concerned about the offset than backspacing. Offset is a consistent measurement for tire placement, whereas backspacing changes tire position with wheel width. For an '02 with 33x12.50 tires, +6mm to 0mm offset will clear the springs and put the tire just inside or flush with the fender. I have -6mm wheels on my '03 right now with 35x12.50 tires and they are about 3/4" from the springs at full lock. The -32mm wheels you are looking at will have plenty of spring clearance, but will stick out about 1" past the fender. Also, with no lift, a large negative offset will stick the tire out more, causing it to move forward and back more when turning and can create fender clearance issues.

 

Both offset and backspacing accomplish the same thing, just in different ways. How is offset any more consistent than backspacing given a wheel width change?

 

Offset is the measurement from the wheel centerline and is independent of width. That tells you exactly how far in or out the tread center (and tread edges for clearance) will move. Backspace can tell you the same thing, but how far in or out the tire sits will also depend on width. I find it easier to just look at offset then have to look at backspace and width and do the conversion.

 

The actual offset measurement is independent of width, but not in regards to wheel placement. A 10" wide wheel and a 8" wide wheel with 0 offset will not sit in the same location in the wheel well when mounted. Just as a 10"/8" wide wheel with 4.5" backspacing will not sit in the same location.

I'm just trying to figure out if we are saying the same thing...just from different sides of the fence. Potato...potato.