225/60R15 vs 235/60R15

235/60R15 is 0.47 in (12.0 mm) taller than 225/60R15, a +1.84% diameter difference. With the speedometer set for 225/60R15, an indicated 60 mph is 61.1 mph on 235/60R15.

Is this a safe swap?

Diameter difference +1.84%: within the ±3% guideline

By overall diameter alone, 235/60R15 falls inside the ±3% range commonly used as a guideline when replacing 225/60R15. 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.

225/60R15 vs 235/60R15 differences
Measurement	225/60R15	235/60R15	Difference	% diff
Overall diameter	25.63 in (651.0 mm)	26.10 in (663.0 mm)	+0.47 in (+12.0 mm)	+1.84%
Sidewall height	5.31 in (135.0 mm)	5.55 in (141.0 mm)	+0.24 in (+6.0 mm)	+4.44%
Section width	8.86 in (225.0 mm)	9.25 in (235.0 mm)	+0.39 in (+10.0 mm)	+4.44%
Circumference	80.52 in (2,045.2 mm)	82.00 in (2,082.9 mm)	+1.48 in (+37.7 mm)	+1.84%
Revolutions per mile	787	773	−14	−1.81%

True speed with the speedometer calibrated for 225/60R15
Indicated	Actual on 225/60R15	Actual on 235/60R15	Difference
30 mph	30.0 mph	30.6 mph	+0.6 mph
60 mph	60.0 mph	61.1 mph	+1.1 mph
75 mph	75.0 mph	76.4 mph	+1.4 mph

Ride-height change: 235/60R15 raises the vehicle by 0.24 in (6.0 mm) at the axle (half the +12.0 mm diameter difference).

235/60R15 is 0.47 in taller than 225/60R15 and 10 mm wider, a 1.84% difference in overall diameter.

With the speedometer calibrated for 225/60R15, an indicated 60 mph is actually 61.1 mph on 235/60R15, and revolutions per mile change from 787 to 773.

Both sizes mount on 15-inch wheels.

Size pages

Other comparisons with 225/60R15

Other comparisons with 235/60R15

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