TireSizesFinder

245/50R18 vs 225/50R19

225/50R19 is 0.21 in (5.4 mm) taller than 245/50R18, a +0.77% diameter difference. With the speedometer set for 245/50R18, an indicated 60 mph is 60.5 mph on 225/50R19.

Is this a safe swap?

Diameter difference +0.77%: under 1%

By overall diameter alone, 225/50R19 is a near match for 245/50R18; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 245/50R18 (27.65 in) vs 225/50R19 (27.86 in)245/50R1827.65 in × 9.65 in225/50R1927.86 in × 8.86 in
Side profile and tread width, drawn to the same scale.
245/50R18 vs 225/50R19 differences
Measurement245/50R18225/50R19Difference% diff
Overall diameter27.65 in (702.2 mm)27.86 in (707.6 mm)+0.21 in (+5.4 mm)+0.77%
Sidewall height4.82 in (122.5 mm)4.43 in (112.5 mm)−0.39 in (−10.0 mm)−8.16%
Section width9.65 in (245.0 mm)8.86 in (225.0 mm)−0.79 in (−20.0 mm)−8.16%
Circumference86.85 in (2,206.0 mm)87.52 in (2,223.0 mm)+0.67 in (+17.0 mm)+0.77%
Revolutions per mile730724−6−0.76%
True speed with the speedometer calibrated for 245/50R18
IndicatedActual on 245/50R18Actual on 225/50R19Difference
30 mph30.0 mph30.2 mph+0.2 mph
60 mph60.0 mph60.5 mph+0.5 mph
75 mph75.0 mph75.6 mph+0.6 mph

Ride-height change: 225/50R19 raises the vehicle by 0.11 in (2.7 mm) at the axle (half the +5.4 mm diameter difference).

225/50R19 is 0.21 in taller than 245/50R18 and 20 mm narrower, a 0.77% difference in overall diameter.

With the speedometer calibrated for 245/50R18, 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-1 fitment from the 18-inch wheel of 245/50R18.

Size pages

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Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.