215/65R15 vs 225/65R15

225/65R15 is 0.51 in (13.0 mm) taller than 215/65R15, a +1.97% diameter difference. With the speedometer set for 215/65R15, an indicated 60 mph is 61.2 mph on 225/65R15.

Is this a safe swap?

Diameter difference +1.97%: within the ±3% guideline

By overall diameter alone, 225/65R15 falls inside the ±3% range commonly used as a guideline when replacing 215/65R15. 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.

215/65R15 vs 225/65R15 differences
Measurement	215/65R15	225/65R15	Difference	% diff
Overall diameter	26.00 in (660.5 mm)	26.52 in (673.5 mm)	+0.51 in (+13.0 mm)	+1.97%
Sidewall height	5.50 in (139.8 mm)	5.76 in (146.3 mm)	+0.26 in (+6.5 mm)	+4.65%
Section width	8.46 in (215.0 mm)	8.86 in (225.0 mm)	+0.39 in (+10.0 mm)	+4.65%
Circumference	81.69 in (2,075.0 mm)	83.30 in (2,115.9 mm)	+1.61 in (+40.8 mm)	+1.97%
Revolutions per mile	776	761	−15	−1.93%

True speed with the speedometer calibrated for 215/65R15
Indicated	Actual on 215/65R15	Actual on 225/65R15	Difference
30 mph	30.0 mph	30.6 mph	+0.6 mph
60 mph	60.0 mph	61.2 mph	+1.2 mph
75 mph	75.0 mph	76.5 mph	+1.5 mph

Ride-height change: 225/65R15 raises the vehicle by 0.26 in (6.5 mm) at the axle (half the +13.0 mm diameter difference).

225/65R15 is 0.51 in taller than 215/65R15 and 10 mm wider, a 1.97% difference in overall diameter.

With the speedometer calibrated for 215/65R15, an indicated 60 mph is actually 61.2 mph on 225/65R15, and revolutions per mile change from 776 to 761.

Both sizes mount on 15-inch wheels.

Size pages

Other comparisons with 215/65R15

Other comparisons with 225/65R15

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