Hey guys, I bought new wheels and tires last summer but never got around to buying a full size spare. My question is how can I find the backspacing that my wheels have? Is there a way to measure it? The tires are BFG's 31x10.5 R15. I have just those standard pro comp rock crawler series 52 steel wheels. Thanks for any help!

 

Measure from the inside mount surface to the inside edge of the wheels, thats your backspacing.

 

Thanks!