TireSizesFinder

225/60R18 vs 245/50R19

245/50R19 is 0.02 in (0.4 mm) taller than 225/60R18, a +0.06% diameter difference. With the speedometer set for 225/60R18, an indicated 60 mph is 60.0 mph on 245/50R19.

Is this a safe swap?

Diameter difference +0.06%: under 1%

By overall diameter alone, 245/50R19 is a near match for 225/60R18; 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: 225/60R18 (28.63 in) vs 245/50R19 (28.65 in)225/60R1828.63 in × 8.86 in245/50R1928.65 in × 9.65 in
Side profile and tread width, drawn to the same scale.
225/60R18 vs 245/50R19 differences
Measurement225/60R18245/50R19Difference% diff
Overall diameter28.63 in (727.2 mm)28.65 in (727.6 mm)+0.02 in (+0.4 mm)+0.06%
Sidewall height5.31 in (135.0 mm)4.82 in (122.5 mm)−0.49 in (−12.5 mm)−9.26%
Section width8.86 in (225.0 mm)9.65 in (245.0 mm)+0.79 in (+20.0 mm)+8.89%
Circumference89.94 in (2,284.6 mm)89.99 in (2,285.8 mm)+0.05 in (+1.3 mm)+0.06%
Revolutions per mile7047040−0.05%
True speed with the speedometer calibrated for 225/60R18
IndicatedActual on 225/60R18Actual on 245/50R19Difference
30 mph30.0 mph30.0 mph0.0 mph
60 mph60.0 mph60.0 mph0.0 mph
75 mph75.0 mph75.0 mph0.0 mph

Ride-height change: 245/50R19 raises the vehicle by 0.01 in (0.2 mm) at the axle (half the +0.4 mm diameter difference).

245/50R19 is 0.02 in taller than 225/60R18 and 20 mm wider, a 0.06% difference in overall diameter.

With the speedometer calibrated for 225/60R18, an indicated 60 mph is actually 60.0 mph on 245/50R19, and revolutions per mile change from 704 to 704.

245/50R19 mounts on a 19-inch wheel, a plus-1 fitment from the 18-inch wheel of 225/60R18.

Size pages

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