TireSizesFinder

31x10.50R15 vs 265/65R17

265/65R17 is 0.44 in (11.1 mm) shorter than 31x10.50R15, a −1.41% diameter difference. With the speedometer set for 31x10.50R15, an indicated 60 mph is 59.2 mph on 265/65R17.

Is this a safe swap?

Diameter difference −1.41%: within the ±3% guideline

By overall diameter alone, 265/65R17 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 265/65R17 (30.56 in)31x10.50R1531.00 in × 10.50 in265/65R1730.56 in × 10.43 in
Side profile and tread width, drawn to the same scale.
31x10.50R15 vs 265/65R17 differences
Measurement31x10.50R15265/65R17Difference% diff
Overall diameter31.00 in (787.4 mm)30.56 in (776.3 mm)−0.44 in (−11.1 mm)−1.41%
Sidewall height8.00 in (203.2 mm)6.78 in (172.3 mm)−1.22 in (−30.9 mm)−15.23%
Section width10.50 in (266.7 mm)10.43 in (265.0 mm)−0.07 in (−1.7 mm)−0.64%
Circumference97.39 in (2,473.7 mm)96.02 in (2,438.8 mm)−1.37 in (−34.9 mm)−1.41%
Revolutions per mile651660+9+1.43%
True speed with the speedometer calibrated for 31x10.50R15
IndicatedActual on 31x10.50R15Actual on 265/65R17Difference
30 mph30.0 mph29.6 mph−0.4 mph
60 mph60.0 mph59.2 mph−0.8 mph
75 mph75.0 mph73.9 mph−1.1 mph

Ride-height change: 265/65R17 lowers the vehicle by 0.22 in (5.6 mm) at the axle (half the −11.1 mm diameter difference).

265/65R17 is 0.44 in shorter than 31x10.50R15 and 2 mm narrower, a 1.41% difference in overall diameter.

With the speedometer calibrated for 31x10.50R15, an indicated 60 mph is actually 59.2 mph on 265/65R17, and revolutions per mile change from 651 to 660.

265/65R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 31x10.50R15.

Size pages

Other comparisons with 31x10.50R15

Other comparisons with 265/65R17

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