TireSizesFinder

31x10.50R16 vs 265/60R18

265/60R18 is 0.48 in (12.2 mm) shorter than 31x10.50R16, a −1.55% diameter difference. With the speedometer set for 31x10.50R16, an indicated 60 mph is 59.1 mph on 265/60R18.

Is this a safe swap?

Diameter difference −1.55%: within the ±3% guideline

By overall diameter alone, 265/60R18 falls inside the ±3% range commonly used as a guideline when replacing 31x10.50R16. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 31x10.50R16 (31.00 in) vs 265/60R18 (30.52 in)31x10.50R1631.00 in × 10.50 in265/60R1830.52 in × 10.43 in
Side profile and tread width, drawn to the same scale.
31x10.50R16 vs 265/60R18 differences
Measurement31x10.50R16265/60R18Difference% diff
Overall diameter31.00 in (787.4 mm)30.52 in (775.2 mm)−0.48 in (−12.2 mm)−1.55%
Sidewall height7.50 in (190.5 mm)6.26 in (159.0 mm)−1.24 in (−31.5 mm)−16.54%
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)95.88 in (2,435.4 mm)−1.51 in (−38.3 mm)−1.55%
Revolutions per mile651661+10+1.57%
True speed with the speedometer calibrated for 31x10.50R16
IndicatedActual on 31x10.50R16Actual on 265/60R18Difference
30 mph30.0 mph29.5 mph−0.5 mph
60 mph60.0 mph59.1 mph−0.9 mph
75 mph75.0 mph73.8 mph−1.2 mph

Ride-height change: 265/60R18 lowers the vehicle by 0.24 in (6.1 mm) at the axle (half the −12.2 mm diameter difference).

265/60R18 is 0.48 in shorter than 31x10.50R16 and 2 mm narrower, a 1.55% difference in overall diameter.

With the speedometer calibrated for 31x10.50R16, an indicated 60 mph is actually 59.1 mph on 265/60R18, and revolutions per mile change from 651 to 661.

265/60R18 mounts on a 18-inch wheel, a plus-2 fitment from the 16-inch wheel of 31x10.50R16.

Size pages

Other comparisons with 31x10.50R16

Other comparisons with 265/60R18

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