315/70R17 vs 37x12.50R17
37x12.50R17 is 7.7% taller (+2.64 in) and 0.10 in wider than 315/70R17.
37x12.50R17 is 7.7% taller than 315/70R17. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears.
| 315/70R17 | 37x12.50R17 | Change | |
|---|---|---|---|
| Diameter | 34.36″ | 37.00″ | +2.64″+7.7% |
| Width | 12.40″ | 12.50″ | +0.10″+0.8% |
| Sidewall | 8.68″ | 10.00″ | +1.32″+15.2% |
| Circumference | 108.0″ | 116.2″ | +8.3″+7.7% |
| Wheel | 17″ | 17″ | Same |
| Revs per mile | 587 | 545 | −42 |
Real speed on 37x12.50R17.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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315/70R17 or 37x12.50R17?
Can I use 37x12.50R17 instead of 315/70R17?
37x12.50R17 is 7.7% taller than 315/70R17. 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 37x12.50R17 you are really doing 64.6 mph if the speedometer was set up for 315/70R17. Going the other way, 315/70R17 would make it read 55.7 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +1.32 in (+34 mm) under the axle.