What backspace?

[01svtL]

I'm looking at 19x9.5 and 19x10 wheels.

Autoanything has two different backspacing available on the 19x10.5: 7.02 and 7.52, both have 45mm offset. How would one fit as opposed to the other?

Is 45mm offset too much for a 10.5" wheel?

[DirtyD]

*Messed up, so I deleted this first part.* I'm not exactly sure on the max and min offset of each width, but I know most try for around +43mm on a x10 wheel

[01svtL]

Yea I'm wondering about that half inch difference on the backspace.

[BV600]

The higher the number the further out of the fender the wheel sticks, except deep dish wheels are a little finicky. If it's a concave/flush face wheel. I'm not exactly sure on the max and min offset of each width, but I know most try for around +43mm on a x10 wheel

I thought the lower the number the more sucked in?
for example New Edge have like 22mm offsets and the stick out a lot on s197s, while ours are sucked in.

[DirtyD]

I thought the lower the number the more sucked in?
for example New Edge have like 22mm offsets and the stick out a lot on s197s, while ours are sucked in.
It depends on the design of the wheel too. If it's not really a deep concave wheel, a lower number will stick out, which I think is the case with new edge wheels.

Man, I thought I finally had this whole offset thing down, but now you have me wondering again. lol

[BV600]

I have no idea now lol.

Honestly when im searching for wheels I go on late model or AM and look at the offsets listed for the common wheels. Like the SVE drifts in 19x9.5 are 35mm

[01svtL]

It depends on the design of the wheel too. If it's not really a concave wheel, a lower number will stick out, which I think is the case with new edge wheels.

Man, I thought I finally had this whole offset thing down, but now you have me wondering again. lol

You pretty much just said the same thing.


But, I'm thinking a higher number is sucked in more, so a 30 offset will stick out further than a 40. That's my understanding. I just don't know what is too much or too little. I also don't know how backspacing affects it.

[DirtyD]

Yeah, I messed up. Guess I wasn't thinking clear enough when I posted yesterday. That's my fault fellas. higher offset is set further away from the wheel center, meaning the inside of the wheel is going to be futher in towards the suspension and inside of the wheel well. deep dish wheels though I think can get away with a lower offset since the hub is located closer towards the center of the wheel to give it lip.

01svtL, there is actually a guy on SVT Performance that is running 19x10.5 ET45 that I saw today. Wheels seem to fit.

[01svtL]

Yeah, I messed up. Guess I wasn't thinking clear enough when I posted yesterday. That's my fault fellas. higher offset is set further away from the wheel center, meaning the inside of the wheel is going to be futher in towards the suspension and inside of the wheel well. deep dish wheels though I think can get away with a lower offset since the hub is located closer towards the center of the wheel to give it lip.

01svtL, there is actually a guy on SVT Performance that is running 19x10.5 ET45 that I saw today. Wheels seem to fit.

Yea I know the offset is ok, i just don't know if that backspace pushes it back out. I believe the standard offset for that wheel at that size is 7.02, but they don't have it. They DO have it in 7.52. But I don't know what that means or how it affects it. I just don't want the wheels to stick out.

[DirtyD]

Maybe a difference in the relief of the spoke design? :shrug:

This is from TireRack. It seems that backspacing is how much room there is between the mounting pad and the back of the spoke/wheel.

Backspacing, similar to offset, is the distance from the hub mounting surface to the inside lip of the wheel (measured in inches).