30x9.50R15 vs 31x10.50R15
31x10.50R15 is 3.3% taller (+1.00 in) and 1.00 in wider than 30x9.50R15.
31x10.50R15 is 3.3% taller than 30x9.50R15. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock.
| 30x9.50R15 | 31x10.50R15 | Change | |
|---|---|---|---|
| Diameter | 30.00″ | 31.00″ | +1.00″+3.3% |
| Width | 9.50″ | 10.50″ | +1.00″+10.5% |
| Sidewall | 7.50″ | 8.00″ | +0.50″+6.7% |
| Circumference | 94.2″ | 97.4″ | +3.1″+3.3% |
| Wheel | 15″ | 15″ | Same |
| Revs per mile | 672 | 651 | −22 |
Real speed on 31x10.50R15.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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30x9.50R15 or 31x10.50R15?
Can I use 31x10.50R15 instead of 30x9.50R15?
31x10.50R15 is 3.3% taller than 30x9.50R15. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock. 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 62.0 mph if the speedometer was set up for 30x9.50R15. Going the other way, 30x9.50R15 would make it read 58.1 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.50 in (+13 mm) under the axle.