225/60R17 vs 245/45R19

245/45R19 is 0.05 in (1.3 mm) taller than 225/60R17, a +0.19% diameter difference. With the speedometer set for 225/60R17, an indicated 60 mph is 60.1 mph on 245/45R19.

Is this a safe swap?

Diameter difference +0.19%: under 1%

By overall diameter alone, 245/45R19 is a near match for 225/60R17; 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.

225/60R17 vs 245/45R19 differences
Measurement	225/60R17	245/45R19	Difference	% diff
Overall diameter	27.63 in (701.8 mm)	27.68 in (703.1 mm)	+0.05 in (+1.3 mm)	+0.19%
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	86.80 in (2,204.8 mm)	86.96 in (2,208.9 mm)	+0.16 in (+4.1 mm)	+0.19%
Revolutions per mile	730	729	−1	−0.18%

True speed with the speedometer calibrated for 225/60R17
Indicated	Actual on 225/60R17	Actual on 245/45R19	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: 245/45R19 raises the vehicle by 0.03 in (0.6 mm) at the axle (half the +1.3 mm diameter difference).

245/45R19 is 0.05 in taller than 225/60R17 and 20 mm wider, a 0.19% difference in overall diameter.

With the speedometer calibrated for 225/60R17, an indicated 60 mph is actually 60.1 mph on 245/45R19, and revolutions per mile change from 730 to 729.

245/45R19 mounts on a 19-inch wheel, a plus-2 fitment from the 17-inch wheel of 225/60R17.

Size pages

Other comparisons with 225/60R17

Other comparisons with 245/45R19

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