I have a 2004 Ram QC 4X4 I have 285/70/17 MTR's that I want to put on it but I hate the way they sit inside the wheel well on the stock wheels. What would the backspacing be on an aftermarket wheel that will get them to sit even with the outside of the fender well? I really dont want them to stick out just want them to be flush with the outside of the truck. Anyone have any suggestions? Thanks

 

What is the backspacing of your current wheels? (Stock 17x7 steels are 5"; I don't know about the aluminum ones)

Work from there, i.e. decide how much farther out you want the new wheels to set and reduce the backspacing by that much for the same width wheels. Obviously, if you go to a wider wheel (as many aftermarket are) you will have to take that into account.

All the best.

 

I have the 17X8 aluminum wheels dont know what the backspacing is but inside the wheel it says 24.5 offset.

 

If that is 24.5 mm it would only be .96 inches or close (and centimeters would be 9.6 inches!!!). Since your wheels should actually be 9 inches, outside rim to outside rim that figure makes no sense; they'd be sticking way out already. Someone said here that they thought the OEM 20-inchers had a backspacing of 5 inches like the narrower ones. That would move the extra width to the outside, but still nothing like what 1 inch would do.

My suggestion: jack it up and pull off a wheel and measure what you've got. From the replies here, or lack there of, I'd suggest this as your quickest answer. Or, you might want to ask on one of the other forums if you haven't already.

Good luck.

 

The 24.5 offset is mm. This is TireRack.com's definition of offset.....


The offset of a wheel is the distance from its hub mounting surface to the centerline of the wheel. The offset can be one of three types.

Zero Offset
The hub mounting surface is even with the centerline of the wheel.

Positive
The hub mounting surface is toward the front or wheel side of the wheel. Positive offset wheels are generally found on front wheel drive cars and newer rear drive cars.

Negative
The hub mounting surface is toward the back or brake side of the wheels centerline. "Deep dish" wheels are typically a negative offset.

If the offset of the wheel is not correct for the car, the handling can be adversely affected. When the width of the wheel changes, the offset also changes numerically. If the offset were to stay the same while you added width, the additional width would be split evenly between the inside and outside. For most cars, this won't work correctly.

 

Here's a wheel offset calculator

 

i put m/t tires on my truck and they stick out of the fenders about 2 inches, and are mounted on eagle alloy 17x8 wheels and they have a -4mm offset to them