TireSizesFinder

225/75R15 vs 235/65R16

235/65R16 is 0.26 in (6.6 mm) shorter than 225/75R15, a −0.92% diameter difference. With the speedometer set for 225/75R15, an indicated 60 mph is 59.4 mph on 235/65R16.

Is this a safe swap?

Diameter difference −0.92%: under 1%

By overall diameter alone, 235/65R16 is a near match for 225/75R15; 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: 225/75R15 (28.29 in) vs 235/65R16 (28.03 in)225/75R1528.29 in × 8.86 in235/65R1628.03 in × 9.25 in
Side profile and tread width, drawn to the same scale.
225/75R15 vs 235/65R16 differences
Measurement225/75R15235/65R16Difference% diff
Overall diameter28.29 in (718.5 mm)28.03 in (711.9 mm)−0.26 in (−6.6 mm)−0.92%
Sidewall height6.64 in (168.8 mm)6.01 in (152.8 mm)−0.63 in (−16.0 mm)−9.48%
Section width8.86 in (225.0 mm)9.25 in (235.0 mm)+0.39 in (+10.0 mm)+4.44%
Circumference88.87 in (2,257.2 mm)88.05 in (2,236.5 mm)−0.82 in (−20.7 mm)−0.92%
Revolutions per mile713720+7+0.93%
True speed with the speedometer calibrated for 225/75R15
IndicatedActual on 225/75R15Actual on 235/65R16Difference
30 mph30.0 mph29.7 mph−0.3 mph
60 mph60.0 mph59.4 mph−0.6 mph
75 mph75.0 mph74.3 mph−0.7 mph

Ride-height change: 235/65R16 lowers the vehicle by 0.13 in (3.3 mm) at the axle (half the −6.6 mm diameter difference).

235/65R16 is 0.26 in shorter than 225/75R15 and 10 mm wider, a 0.92% difference in overall diameter.

With the speedometer calibrated for 225/75R15, an indicated 60 mph is actually 59.4 mph on 235/65R16, and revolutions per mile change from 713 to 720.

235/65R16 mounts on a 16-inch wheel, a plus-1 fitment from the 15-inch wheel of 225/75R15.

Size pages

Other comparisons with 225/75R15

Other comparisons with 235/65R16

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