205/70R14 vs 225/60R15

225/60R15 is 0.33 in (8.4 mm) taller than 205/70R14, a +1.31% diameter difference. With the speedometer set for 205/70R14, an indicated 60 mph is 60.8 mph on 225/60R15.

Is this a safe swap?

Diameter difference +1.31%: within the ±3% guideline

By overall diameter alone, 225/60R15 falls inside the ±3% range commonly used as a guideline when replacing 205/70R14. 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.

205/70R14 vs 225/60R15 differences
Measurement	205/70R14	225/60R15	Difference	% diff
Overall diameter	25.30 in (642.6 mm)	25.63 in (651.0 mm)	+0.33 in (+8.4 mm)	+1.31%
Sidewall height	5.65 in (143.5 mm)	5.31 in (135.0 mm)	−0.33 in (−8.5 mm)	−5.92%
Section width	8.07 in (205.0 mm)	8.86 in (225.0 mm)	+0.79 in (+20.0 mm)	+9.76%
Circumference	79.48 in (2,018.8 mm)	80.52 in (2,045.2 mm)	+1.04 in (+26.4 mm)	+1.31%
Revolutions per mile	797	787	−10	−1.29%

True speed with the speedometer calibrated for 205/70R14
Indicated	Actual on 205/70R14	Actual on 225/60R15	Difference
30 mph	30.0 mph	30.4 mph	+0.4 mph
60 mph	60.0 mph	60.8 mph	+0.8 mph
75 mph	75.0 mph	76.0 mph	+1.0 mph

Ride-height change: 225/60R15 raises the vehicle by 0.17 in (4.2 mm) at the axle (half the +8.4 mm diameter difference).

225/60R15 is 0.33 in taller than 205/70R14 and 20 mm wider, a 1.31% difference in overall diameter.

With the speedometer calibrated for 205/70R14, an indicated 60 mph is actually 60.8 mph on 225/60R15, and revolutions per mile change from 797 to 787.

225/60R15 mounts on a 15-inch wheel, a plus-1 fitment from the 14-inch wheel of 205/70R14.

Size pages

Other comparisons with 205/70R14

Other comparisons with 225/60R15

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