TireSizesFinder

31x10.50R15 vs 245/75R16

245/75R16 is 0.53 in (13.5 mm) shorter than 31x10.50R15, a −1.71% diameter difference. With the speedometer set for 31x10.50R15, an indicated 60 mph is 59.0 mph on 245/75R16.

Is this a safe swap?

Diameter difference −1.71%: within the ±3% guideline

By overall diameter alone, 245/75R16 falls inside the ±3% range commonly used as a guideline when replacing 31x10.50R15. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 31x10.50R15 (31.00 in) vs 245/75R16 (30.47 in)31x10.50R1531.00 in × 10.50 in245/75R1630.47 in × 9.65 in
Side profile and tread width, drawn to the same scale.
31x10.50R15 vs 245/75R16 differences
Measurement31x10.50R15245/75R16Difference% diff
Overall diameter31.00 in (787.4 mm)30.47 in (773.9 mm)−0.53 in (−13.5 mm)−1.71%
Sidewall height8.00 in (203.2 mm)7.23 in (183.8 mm)−0.77 in (−19.4 mm)−9.57%
Section width10.50 in (266.7 mm)9.65 in (245.0 mm)−0.85 in (−21.7 mm)−8.14%
Circumference97.39 in (2,473.7 mm)95.72 in (2,431.3 mm)−1.67 in (−42.4 mm)−1.71%
Revolutions per mile651662+11+1.74%
True speed with the speedometer calibrated for 31x10.50R15
IndicatedActual on 31x10.50R15Actual on 245/75R16Difference
30 mph30.0 mph29.5 mph−0.5 mph
60 mph60.0 mph59.0 mph−1.0 mph
75 mph75.0 mph73.7 mph−1.3 mph

Ride-height change: 245/75R16 lowers the vehicle by 0.27 in (6.8 mm) at the axle (half the −13.5 mm diameter difference).

245/75R16 is 0.53 in shorter than 31x10.50R15 and 22 mm narrower, a 1.71% difference in overall diameter.

With the speedometer calibrated for 31x10.50R15, an indicated 60 mph is actually 59.0 mph on 245/75R16, and revolutions per mile change from 651 to 662.

245/75R16 mounts on a 16-inch wheel, a plus-1 fitment from the 15-inch wheel of 31x10.50R15.

Size pages

Other comparisons with 31x10.50R15

Other comparisons with 245/75R16

Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.