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Spare tire size?

Trigger Creep

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May 6, 2002
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Bham, WA
Anyone know where to find a tire size calculator by diameter or revs per mile?

I need an appropriate sized spare to run with my 31x10.5-15's. I need a tall, slim tire that has a 30.8" diameter or runs at 679 revs per mile.
 
if your looking for more space in the rear for cargo , find a 215/85r16 ( 30.6 tall , use air pressure lower in taller tire if you have to have perfect match in rear ) and a skinny six lug spare rim ( newer rims require machining axle register hole bigger ) .
 
if your looking for more space in the rear for cargo , find a 215/85r16 ( newer rims require machining axle register hole bigger ) .

A little more work than I wanted, but the result is better with the thinner rim. 6.8" vs 10.6" section - almost 4" thinner.

Thanks!
 

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