315/75R16 vs 35x12.50R15
35x12.50R15 is 1.1% taller (+0.40 in) and 0.10 in wider than 315/75R16.
35x12.50R15 is 1.1% taller than 315/75R16. That is inside the ±3% most shops treat as a straight swap.
| 315/75R16 | 35x12.50R15 | Change | |
|---|---|---|---|
| Diameter | 34.60″ | 35.00″ | +0.40″+1.1% |
| Width | 12.40″ | 12.50″ | +0.10″+0.8% |
| Sidewall | 9.30″ | 10.00″ | +0.70″+7.5% |
| Circumference | 108.7″ | 110.0″ | +1.2″+1.1% |
| Wheel | 16″ | 15″ | −1″ |
| Revs per mile | 583 | 576 | −7 |
Real speed on 35x12.50R15.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 35x12.50R15 tires
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315/75R16 or 35x12.50R15?
Can I use 35x12.50R15 instead of 315/75R16?
35x12.50R15 is 1.1% taller than 315/75R16. 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 35x12.50R15 you are really doing 60.7 mph if the speedometer was set up for 315/75R16. Going the other way, 315/75R16 would make it read 59.3 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.20 in (+5 mm) under the axle.