225/75R15 vs 245/60R17

245/60R17 is 0.29 in (7.3 mm) taller than 225/75R15, a +1.02% diameter difference. With the speedometer set for 225/75R15, an indicated 60 mph is 60.6 mph on 245/60R17.

Is this a safe swap?

Diameter difference +1.02%: within the ±3% guideline

By overall diameter alone, 245/60R17 falls inside the ±3% range commonly used as a guideline when replacing 225/75R15. 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.

225/75R15 vs 245/60R17 differences
Measurement	225/75R15	245/60R17	Difference	% diff
Overall diameter	28.29 in (718.5 mm)	28.57 in (725.8 mm)	+0.29 in (+7.3 mm)	+1.02%
Sidewall height	6.64 in (168.8 mm)	5.79 in (147.0 mm)	−0.86 in (−21.7 mm)	−12.89%
Section width	8.86 in (225.0 mm)	9.65 in (245.0 mm)	+0.79 in (+20.0 mm)	+8.89%
Circumference	88.87 in (2,257.2 mm)	89.77 in (2,280.2 mm)	+0.90 in (+22.9 mm)	+1.02%
Revolutions per mile	713	706	−7	−1.01%

True speed with the speedometer calibrated for 225/75R15
Indicated	Actual on 225/75R15	Actual on 245/60R17	Difference
30 mph	30.0 mph	30.3 mph	+0.3 mph
60 mph	60.0 mph	60.6 mph	+0.6 mph
75 mph	75.0 mph	75.8 mph	+0.8 mph

Ride-height change: 245/60R17 raises the vehicle by 0.14 in (3.6 mm) at the axle (half the +7.3 mm diameter difference).

245/60R17 is 0.29 in taller than 225/75R15 and 20 mm wider, a 1.02% difference in overall diameter.

With the speedometer calibrated for 225/75R15, an indicated 60 mph is actually 60.6 mph on 245/60R17, and revolutions per mile change from 713 to 706.

245/60R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 225/75R15.

Size pages

Other comparisons with 225/75R15

Other comparisons with 245/60R17

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