How do I tell how much back spacing my wheels have?

90Pioneer · Sep 13, 2006

I have a set of 15x8 AR767s mounted on 33x12.5 Trxus MTs.

How do I tell how much back spacing these wheels have? Is there any way I can do it with them still mounted on my jeep?

Does it affect anything if you run a wheel/tire with a different back spacing than the other 3?

Ramsey · Sep 13, 2006

Backspacing is the distance from the plane of the mounting surface (where the wheel rests against the hubs) to the inner bead of the wheel (the bead closer to the vehicle centerline).

90Pioneer · Sep 13, 2006

Can this be measued without me taking a tire off of the jeep?

Ramsey · Sep 13, 2006

probably, get a tape measure, and see if you can. I wouldnt want to run 2 different backspaced wheels.

Cornflake · Sep 13, 2006

i run 33 X 12.5 X 15 inch tire on aftermarket wheels with a 3.75 - 4 inch backspacing. can't remember exactly. they stick out but don't rub.

90Pioneer · Sep 15, 2006

Well I *think* my wheels have a 4" back spacing on them, but I can't remember if it's 4 or 4.5".

I was given a new matching spare tire and wheel as a gift. The new wheel has 4.5" back spacing on it. I'm really anal and want to be sure they all match exactly.

It's definately not something that is easy to measure accurately.

Chero-King · Sep 15, 2006

Stick a peice of wood across the center and have it rest inner bead and measure up to that, it'll give you a better measurment

WrenchMonkey · Sep 15, 2006

90Pioneer said:
Well I *think* my wheels have a 4" back spacing on them, but I can't remember if it's 4 or 4.5".

I was given a new matching spare tire and wheel as a gift. The new wheel has 4.5" back spacing on it. I'm really anal and want to be sure they all match exactly.

It's definately not something that is easy to measure accurately.

Well, if you're not looking for the actual backspace measurement, but just checking for a "match," I'd measure the "frontspacing" since it'll be much easier on the jeep. Run a straightedge across the front bulge of the tire, and measure back to the base of the lugnuts. Repeat for your new spare...

Robert

Starboard M · Sep 15, 2006

90Pioneer said:
Well I *think* my wheels have a 4" back spacing on them, but I can't remember if it's 4 or 4.5".

I was given a new matching spare tire and wheel as a gift. The new wheel has 4.5" back spacing on it. I'm really anal and want to be sure they all match exactly.

It's definately not something that is easy to measure accurately.

Take it off the Jeep:gee:

How do I tell how much back spacing my wheels have?

90Pioneer

NAXJA Forum User

Ramsey

NAXJA Forum User

90Pioneer

NAXJA Forum User

Ramsey

NAXJA Forum User

Cornflake

NAXJA Forum User

90Pioneer

NAXJA Forum User

Chero-King

NAXJA Forum User

WrenchMonkey

NAXJA Member #771

Starboard M

NAXJA Member

Similar threads