235/75R17 vs 31x10.50R15
31x10.50R15 is 0.4% taller (+0.12 in) and 1.25 in wider than 235/75R17.
31x10.50R15 is 0.4% taller than 235/75R17. That is inside the ±3% most shops treat as a straight swap.
| 235/75R17 | 31x10.50R15 | Change | |
|---|---|---|---|
| Diameter | 30.88″ | 31.00″ | +0.12″+0.4% |
| Width | 9.25″ | 10.50″ | +1.25″+13.5% |
| Sidewall | 6.94″ | 8.00″ | +1.06″+15.3% |
| Circumference | 97.0″ | 97.4″ | +0.4″+0.4% |
| Wheel | 17″ | 15″ | −2″ |
| Revs per mile | 653 | 651 | −3 |
Real speed on 31x10.50R15.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 31x10.50R15 tires
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235/75R17 or 31x10.50R15?
Can I use 31x10.50R15 instead of 235/75R17?
31x10.50R15 is 0.4% taller than 235/75R17. That is inside the ±3% most shops treat as a straight swap. 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 60.2 mph if the speedometer was set up for 235/75R17. Going the other way, 235/75R17 would make it read 59.8 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.06 in (+2 mm) under the axle.