225/70R14 vs 235/60R15

235/60R15 is 0.30 in (7.6 mm) shorter than 225/70R14, a −1.13% diameter difference. With the speedometer set for 225/70R14, an indicated 60 mph is 59.3 mph on 235/60R15.

Is this a safe swap?

Diameter difference −1.13%: within the ±3% guideline

By overall diameter alone, 235/60R15 falls inside the ±3% range commonly used as a guideline when replacing 225/70R14. 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.

225/70R14 vs 235/60R15 differences
Measurement	225/70R14	235/60R15	Difference	% diff
Overall diameter	26.40 in (670.6 mm)	26.10 in (663.0 mm)	−0.30 in (−7.6 mm)	−1.13%
Sidewall height	6.20 in (157.5 mm)	5.55 in (141.0 mm)	−0.65 in (−16.5 mm)	−10.48%
Section width	8.86 in (225.0 mm)	9.25 in (235.0 mm)	+0.39 in (+10.0 mm)	+4.44%
Circumference	82.94 in (2,106.8 mm)	82.00 in (2,082.9 mm)	−0.94 in (−23.9 mm)	−1.13%
Revolutions per mile	764	773	+9	+1.15%

True speed with the speedometer calibrated for 225/70R14
Indicated	Actual on 225/70R14	Actual on 235/60R15	Difference
30 mph	30.0 mph	29.7 mph	−0.3 mph
60 mph	60.0 mph	59.3 mph	−0.7 mph
75 mph	75.0 mph	74.2 mph	−0.8 mph

Ride-height change: 235/60R15 lowers the vehicle by 0.15 in (3.8 mm) at the axle (half the −7.6 mm diameter difference).

235/60R15 is 0.30 in shorter than 225/70R14 and 10 mm wider, a 1.13% difference in overall diameter.

With the speedometer calibrated for 225/70R14, an indicated 60 mph is actually 59.3 mph on 235/60R15, and revolutions per mile change from 764 to 773.

235/60R15 mounts on a 15-inch wheel, a plus-1 fitment from the 14-inch wheel of 225/70R14.

Size pages

Other comparisons with 225/70R14

Other comparisons with 235/60R15

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