33x12.50R17 vs 315/70R17
315/70R17 is 4.1% taller (+1.36 in) and 0.10 in narrower than 33x12.50R17.
315/70R17 is 4.1% taller than 33x12.50R17. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock.
| 33x12.50R17 | 315/70R17 | Change | |
|---|---|---|---|
| Diameter | 33.00″ | 34.36″ | +1.36″+4.1% |
| Width | 12.50″ | 12.40″ | −0.10″−0.8% |
| Sidewall | 8.00″ | 8.68″ | +0.68″+8.5% |
| Circumference | 103.7″ | 108.0″ | +4.3″+4.1% |
| Wheel | 17″ | 17″ | Same |
| Revs per mile | 611 | 587 | −24 |
Real speed on 315/70R17.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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33x12.50R17 or 315/70R17?
Can I use 315/70R17 instead of 33x12.50R17?
315/70R17 is 4.1% taller than 33x12.50R17. 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 315/70R17 you are really doing 62.5 mph if the speedometer was set up for 33x12.50R17. Going the other way, 33x12.50R17 would make it read 57.6 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.68 in (+17 mm) under the axle.