255/70R15 vs 31x10.50R15
31x10.50R15 is 6.7% taller (+1.94 in) and 0.46 in wider than 255/70R15.
31x10.50R15 is 6.7% taller than 255/70R15. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears.
| 255/70R15 | 31x10.50R15 | Change | |
|---|---|---|---|
| Diameter | 29.06″ | 31.00″ | +1.94″+6.7% |
| Width | 10.04″ | 10.50″ | +0.46″+4.6% |
| Sidewall | 7.03″ | 8.00″ | +0.97″+13.8% |
| Circumference | 91.3″ | 97.4″ | +6.1″+6.7% |
| Wheel | 15″ | 15″ | Same |
| Revs per mile | 694 | 651 | −44 |
Real speed on 31x10.50R15.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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255/70R15 or 31x10.50R15?
Can I use 31x10.50R15 instead of 255/70R15?
31x10.50R15 is 6.7% taller than 255/70R15. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears. Also match or beat the original load index and speed rating, and check that the wheel width suits the new tire.
Will my speedometer be off?
At an indicated 60 mph on 31x10.50R15 you are really doing 64.0 mph if the speedometer was set up for 255/70R15. Going the other way, 255/70R15 would make it read 56.2 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.97 in (+25 mm) under the axle.