215/75R15 vs 235/65R16

235/65R16 is 0.33 in (8.4 mm) taller than 215/75R15, a +1.19% diameter difference. With the speedometer set for 215/75R15, an indicated 60 mph is 60.7 mph on 235/65R16.

Is this a safe swap?

Diameter difference +1.19%: within the ±3% guideline

By overall diameter alone, 235/65R16 falls inside the ±3% range commonly used as a guideline when replacing 215/75R15. 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.

215/75R15 vs 235/65R16 differences
Measurement	215/75R15	235/65R16	Difference	% diff
Overall diameter	27.70 in (703.5 mm)	28.03 in (711.9 mm)	+0.33 in (+8.4 mm)	+1.19%
Sidewall height	6.35 in (161.3 mm)	6.01 in (152.8 mm)	−0.33 in (−8.5 mm)	−5.27%
Section width	8.46 in (215.0 mm)	9.25 in (235.0 mm)	+0.79 in (+20.0 mm)	+9.30%
Circumference	87.01 in (2,210.1 mm)	88.05 in (2,236.5 mm)	+1.04 in (+26.4 mm)	+1.19%
Revolutions per mile	728	720	−9	−1.18%

True speed with the speedometer calibrated for 215/75R15
Indicated	Actual on 215/75R15	Actual on 235/65R16	Difference
30 mph	30.0 mph	30.4 mph	+0.4 mph
60 mph	60.0 mph	60.7 mph	+0.7 mph
75 mph	75.0 mph	75.9 mph	+0.9 mph

Ride-height change: 235/65R16 raises the vehicle by 0.17 in (4.2 mm) at the axle (half the +8.4 mm diameter difference).

235/65R16 is 0.33 in taller than 215/75R15 and 20 mm wider, a 1.19% difference in overall diameter.

With the speedometer calibrated for 215/75R15, an indicated 60 mph is actually 60.7 mph on 235/65R16, and revolutions per mile change from 728 to 720.

235/65R16 mounts on a 16-inch wheel, a plus-1 fitment from the 15-inch wheel of 215/75R15.

Size pages

Other comparisons with 215/75R15

Other comparisons with 235/65R16

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