225/60R15 vs 245/45R17

245/45R17 is 0.05 in (1.3 mm) taller than 225/60R15, a +0.20% diameter difference. With the speedometer set for 225/60R15, an indicated 60 mph is 60.1 mph on 245/45R17.

Is this a safe swap?

Diameter difference +0.20%: under 1%

By overall diameter alone, 245/45R17 is a near match for 225/60R15; 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.

225/60R15 vs 245/45R17 differences
Measurement	225/60R15	245/45R17	Difference	% diff
Overall diameter	25.63 in (651.0 mm)	25.68 in (652.3 mm)	+0.05 in (+1.3 mm)	+0.20%
Sidewall height	5.31 in (135.0 mm)	4.34 in (110.3 mm)	−0.97 in (−24.7 mm)	−18.33%
Section width	8.86 in (225.0 mm)	9.65 in (245.0 mm)	+0.79 in (+20.0 mm)	+8.89%
Circumference	80.52 in (2,045.2 mm)	80.68 in (2,049.3 mm)	+0.16 in (+4.1 mm)	+0.20%
Revolutions per mile	787	785	−2	−0.20%

True speed with the speedometer calibrated for 225/60R15
Indicated	Actual on 225/60R15	Actual on 245/45R17	Difference
30 mph	30.0 mph	30.1 mph	+0.1 mph
60 mph	60.0 mph	60.1 mph	+0.1 mph
75 mph	75.0 mph	75.1 mph	+0.1 mph

Ride-height change: 245/45R17 raises the vehicle by 0.03 in (0.6 mm) at the axle (half the +1.3 mm diameter difference).

245/45R17 is 0.05 in taller than 225/60R15 and 20 mm wider, a 0.20% difference in overall diameter.

With the speedometer calibrated for 225/60R15, an indicated 60 mph is actually 60.1 mph on 245/45R17, and revolutions per mile change from 787 to 785.

245/45R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 225/60R15.

Size pages

Other comparisons with 225/60R15

Other comparisons with 245/45R17

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