TireSizesFinder

31x10.50R15 vs 275/65R17

275/65R17 is 0.07 in (1.9 mm) taller than 31x10.50R15, a +0.24% diameter difference. With the speedometer set for 31x10.50R15, an indicated 60 mph is 60.1 mph on 275/65R17.

Is this a safe swap?

Diameter difference +0.24%: under 1%

By overall diameter alone, 275/65R17 is a near match for 31x10.50R15; the speedometer changes by less than 1%. 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 275/65R17 (31.07 in)31x10.50R1531.00 in × 10.50 in275/65R1731.07 in × 10.83 in
Side profile and tread width, drawn to the same scale.
31x10.50R15 vs 275/65R17 differences
Measurement31x10.50R15275/65R17Difference% diff
Overall diameter31.00 in (787.4 mm)31.07 in (789.3 mm)+0.07 in (+1.9 mm)+0.24%
Sidewall height8.00 in (203.2 mm)7.04 in (178.8 mm)−0.96 in (−24.4 mm)−12.03%
Section width10.50 in (266.7 mm)10.83 in (275.0 mm)+0.33 in (+8.3 mm)+3.11%
Circumference97.39 in (2,473.7 mm)97.62 in (2,479.7 mm)+0.24 in (+6.0 mm)+0.24%
Revolutions per mile651649−2−0.24%
True speed with the speedometer calibrated for 31x10.50R15
IndicatedActual on 31x10.50R15Actual on 275/65R17Difference
30 mph30.0 mph30.1 mph+0.1 mph
60 mph60.0 mph60.1 mph+0.1 mph
75 mph75.0 mph75.2 mph+0.2 mph

Ride-height change: 275/65R17 raises the vehicle by 0.04 in (0.9 mm) at the axle (half the +1.9 mm diameter difference).

275/65R17 is 0.07 in taller than 31x10.50R15 and 8 mm wider, a 0.24% difference in overall diameter.

With the speedometer calibrated for 31x10.50R15, an indicated 60 mph is actually 60.1 mph on 275/65R17, and revolutions per mile change from 651 to 649.

275/65R17 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 275/65R17

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