205/75R14 vs 225/60R15

225/60R15 is 0.48 in (12.1 mm) shorter than 205/75R14, a −1.82% diameter difference. With the speedometer set for 205/75R14, an indicated 60 mph is 58.9 mph on 225/60R15.

Is this a safe swap?

Diameter difference −1.82%: within the ±3% guideline

By overall diameter alone, 225/60R15 falls inside the ±3% range commonly used as a guideline when replacing 205/75R14. 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.

205/75R14 vs 225/60R15 differences
Measurement	205/75R14	225/60R15	Difference	% diff
Overall diameter	26.11 in (663.1 mm)	25.63 in (651.0 mm)	−0.48 in (−12.1 mm)	−1.82%
Sidewall height	6.05 in (153.8 mm)	5.31 in (135.0 mm)	−0.74 in (−18.7 mm)	−12.20%
Section width	8.07 in (205.0 mm)	8.86 in (225.0 mm)	+0.79 in (+20.0 mm)	+9.76%
Circumference	82.02 in (2,083.2 mm)	80.52 in (2,045.2 mm)	−1.50 in (−38.0 mm)	−1.82%
Revolutions per mile	773	787	+14	+1.86%

True speed with the speedometer calibrated for 205/75R14
Indicated	Actual on 205/75R14	Actual on 225/60R15	Difference
30 mph	30.0 mph	29.5 mph	−0.5 mph
60 mph	60.0 mph	58.9 mph	−1.1 mph
75 mph	75.0 mph	73.6 mph	−1.4 mph

Ride-height change: 225/60R15 lowers the vehicle by 0.24 in (6.0 mm) at the axle (half the −12.1 mm diameter difference).

225/60R15 is 0.48 in shorter than 205/75R14 and 20 mm wider, a 1.82% difference in overall diameter.

With the speedometer calibrated for 205/75R14, an indicated 60 mph is actually 58.9 mph on 225/60R15, and revolutions per mile change from 773 to 787.

225/60R15 mounts on a 15-inch wheel, a plus-1 fitment from the 14-inch wheel of 205/75R14.

Size pages

Other comparisons with 205/75R14

Other comparisons with 225/60R15

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