225/65R15 vs 245/50R17

245/50R17 is 0.13 in (3.3 mm) taller than 225/65R15, a +0.49% diameter difference. With the speedometer set for 225/65R15, an indicated 60 mph is 60.3 mph on 245/50R17.

Is this a safe swap?

Diameter difference +0.49%: under 1%

By overall diameter alone, 245/50R17 is a near match for 225/65R15; the speedometer changes by less than 1%. 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.

225/65R15 vs 245/50R17 differences
Measurement	225/65R15	245/50R17	Difference	% diff
Overall diameter	26.52 in (673.5 mm)	26.65 in (676.8 mm)	+0.13 in (+3.3 mm)	+0.49%
Sidewall height	5.76 in (146.3 mm)	4.82 in (122.5 mm)	−0.94 in (−23.7 mm)	−16.24%
Section width	8.86 in (225.0 mm)	9.65 in (245.0 mm)	+0.79 in (+20.0 mm)	+8.89%
Circumference	83.30 in (2,115.9 mm)	83.71 in (2,126.2 mm)	+0.41 in (+10.4 mm)	+0.49%
Revolutions per mile	761	757	−4	−0.49%

True speed with the speedometer calibrated for 225/65R15
Indicated	Actual on 225/65R15	Actual on 245/50R17	Difference
30 mph	30.0 mph	30.1 mph	+0.1 mph
60 mph	60.0 mph	60.3 mph	+0.3 mph
75 mph	75.0 mph	75.4 mph	+0.4 mph

Ride-height change: 245/50R17 raises the vehicle by 0.06 in (1.6 mm) at the axle (half the +3.3 mm diameter difference).

245/50R17 is 0.13 in taller than 225/65R15 and 20 mm wider, a 0.49% difference in overall diameter.

With the speedometer calibrated for 225/65R15, an indicated 60 mph is actually 60.3 mph on 245/50R17, and revolutions per mile change from 761 to 757.

245/50R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 225/65R15.

Size pages

Other comparisons with 225/65R15

Other comparisons with 245/50R17

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