205/75R14 vs 225/65R15

225/65R15 is 0.41 in (10.4 mm) taller than 205/75R14, a +1.57% diameter difference. With the speedometer set for 205/75R14, an indicated 60 mph is 60.9 mph on 225/65R15.

Is this a safe swap?

Diameter difference +1.57%: within the ±3% guideline

By overall diameter alone, 225/65R15 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 225/65R15 differences
Measurement	205/75R14	225/65R15	Difference	% diff
Overall diameter	26.11 in (663.1 mm)	26.52 in (673.5 mm)	+0.41 in (+10.4 mm)	+1.57%
Sidewall height	6.05 in (153.8 mm)	5.76 in (146.3 mm)	−0.30 in (−7.5 mm)	−4.88%
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)	83.30 in (2,115.9 mm)	+1.29 in (+32.7 mm)	+1.57%
Revolutions per mile	773	761	−12	−1.54%

True speed with the speedometer calibrated for 205/75R14
Indicated	Actual on 205/75R14	Actual on 225/65R15	Difference
30 mph	30.0 mph	30.5 mph	+0.5 mph
60 mph	60.0 mph	60.9 mph	+0.9 mph
75 mph	75.0 mph	76.2 mph	+1.2 mph

Ride-height change: 225/65R15 raises the vehicle by 0.20 in (5.2 mm) at the axle (half the +10.4 mm diameter difference).

225/65R15 is 0.41 in taller than 205/75R14 and 20 mm wider, a 1.57% difference in overall diameter.

With the speedometer calibrated for 205/75R14, an indicated 60 mph is actually 60.9 mph on 225/65R15, and revolutions per mile change from 773 to 761.

225/65R15 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 225/65R15

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