235/70R15 vs 235/65R16

235/65R16 is 0.07 in (1.9 mm) taller than 235/70R15, a +0.27% diameter difference. With the speedometer set for 235/70R15, an indicated 60 mph is 60.2 mph on 235/65R16.

Is this a safe swap?

Diameter difference +0.27%: under 1%

By overall diameter alone, 235/65R16 is a near match for 235/70R15; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

Side profile and tread width, drawn to the same scale.

235/70R15 vs 235/65R16 differences
Measurement	235/70R15	235/65R16	Difference	% diff
Overall diameter	27.95 in (710.0 mm)	28.03 in (711.9 mm)	+0.07 in (+1.9 mm)	+0.27%
Sidewall height	6.48 in (164.5 mm)	6.01 in (152.8 mm)	−0.46 in (−11.7 mm)	−7.14%
Section width	9.25 in (235.0 mm)	9.25 in (235.0 mm)	0.00 in (0.0 mm)	0.00%
Circumference	87.82 in (2,230.5 mm)	88.05 in (2,236.5 mm)	+0.24 in (+6.0 mm)	+0.27%
Revolutions per mile	722	720	−2	−0.27%

True speed with the speedometer calibrated for 235/70R15
Indicated	Actual on 235/70R15	Actual on 235/65R16	Difference
30 mph	30.0 mph	30.1 mph	+0.1 mph
60 mph	60.0 mph	60.2 mph	+0.2 mph
75 mph	75.0 mph	75.2 mph	+0.2 mph

Ride-height change: 235/65R16 raises the vehicle by 0.04 in (0.9 mm) at the axle (half the +1.9 mm diameter difference).

235/65R16 is 0.07 in taller than 235/70R15 and the same width, a 0.27% difference in overall diameter.

With the speedometer calibrated for 235/70R15, an indicated 60 mph is actually 60.2 mph on 235/65R16, and revolutions per mile change from 722 to 720.

235/65R16 mounts on a 16-inch wheel, a plus-1 fitment from the 15-inch wheel of 235/70R15.

Size pages

Other comparisons with 235/70R15

Other comparisons with 235/65R16

Source: Calculated from standard tire geometry formulas. Verified 2026-09-27. How these numbers are calculated.