245/55R17 vs 225/50R19

225/50R19 is 0.25 in (6.3 mm) taller than 245/55R17, a +0.90% diameter difference. With the speedometer set for 245/55R17, an indicated 60 mph is 60.5 mph on 225/50R19.

Is this a safe swap?

Diameter difference +0.90%: under 1%

By overall diameter alone, 225/50R19 is a near match for 245/55R17; 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.

245/55R17 vs 225/50R19 differences
Measurement	245/55R17	225/50R19	Difference	% diff
Overall diameter	27.61 in (701.3 mm)	27.86 in (707.6 mm)	+0.25 in (+6.3 mm)	+0.90%
Sidewall height	5.31 in (134.8 mm)	4.43 in (112.5 mm)	−0.88 in (−22.2 mm)	−16.51%
Section width	9.65 in (245.0 mm)	8.86 in (225.0 mm)	−0.79 in (−20.0 mm)	−8.16%
Circumference	86.74 in (2,203.2 mm)	87.52 in (2,223.0 mm)	+0.78 in (+19.8 mm)	+0.90%
Revolutions per mile	730	724	−7	−0.89%

True speed with the speedometer calibrated for 245/55R17
Indicated	Actual on 245/55R17	Actual on 225/50R19	Difference
30 mph	30.0 mph	30.3 mph	+0.3 mph
60 mph	60.0 mph	60.5 mph	+0.5 mph
75 mph	75.0 mph	75.7 mph	+0.7 mph

Ride-height change: 225/50R19 raises the vehicle by 0.12 in (3.1 mm) at the axle (half the +6.3 mm diameter difference).

225/50R19 is 0.25 in taller than 245/55R17 and 20 mm narrower, a 0.90% difference in overall diameter.

With the speedometer calibrated for 245/55R17, an indicated 60 mph is actually 60.5 mph on 225/50R19, and revolutions per mile change from 730 to 724.

225/50R19 mounts on a 19-inch wheel, a plus-2 fitment from the 17-inch wheel of 245/55R17.

Size pages

Other comparisons with 245/55R17

Other comparisons with 225/50R19

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