235/60R15 vs 205/65R16

205/65R16 is 0.39 in (9.9 mm) taller than 235/60R15, a +1.49% diameter difference. With the speedometer set for 235/60R15, an indicated 60 mph is 60.9 mph on 205/65R16.

Is this a safe swap?

Diameter difference +1.49%: within the ±3% guideline

By overall diameter alone, 205/65R16 falls inside the ±3% range commonly used as a guideline when replacing 235/60R15. 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.

235/60R15 vs 205/65R16 differences
Measurement	235/60R15	205/65R16	Difference	% diff
Overall diameter	26.10 in (663.0 mm)	26.49 in (672.9 mm)	+0.39 in (+9.9 mm)	+1.49%
Sidewall height	5.55 in (141.0 mm)	5.25 in (133.3 mm)	−0.31 in (−7.7 mm)	−5.50%
Section width	9.25 in (235.0 mm)	8.07 in (205.0 mm)	−1.18 in (−30.0 mm)	−12.77%
Circumference	82.00 in (2,082.9 mm)	83.23 in (2,114.0 mm)	+1.22 in (+31.1 mm)	+1.49%
Revolutions per mile	773	761	−11	−1.47%

True speed with the speedometer calibrated for 235/60R15
Indicated	Actual on 235/60R15	Actual on 205/65R16	Difference
30 mph	30.0 mph	30.4 mph	+0.4 mph
60 mph	60.0 mph	60.9 mph	+0.9 mph
75 mph	75.0 mph	76.1 mph	+1.1 mph

Ride-height change: 205/65R16 raises the vehicle by 0.19 in (4.9 mm) at the axle (half the +9.9 mm diameter difference).

205/65R16 is 0.39 in taller than 235/60R15 and 30 mm narrower, a 1.49% difference in overall diameter.

With the speedometer calibrated for 235/60R15, an indicated 60 mph is actually 60.9 mph on 205/65R16, and revolutions per mile change from 773 to 761.

205/65R16 mounts on a 16-inch wheel, a plus-1 fitment from the 15-inch wheel of 235/60R15.

Size pages

Other comparisons with 235/60R15

Other comparisons with 205/65R16

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