TireSizesFinder

265/30R19 vs 225/30R20

225/30R20 is 0.06 in (1.4 mm) taller than 265/30R19, a +0.22% diameter difference. With the speedometer set for 265/30R19, an indicated 60 mph is 60.1 mph on 225/30R20.

Is this a safe swap?

Diameter difference +0.22%: under 1%

By overall diameter alone, 225/30R20 is a near match for 265/30R19; 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: 265/30R19 (25.26 in) vs 225/30R20 (25.31 in)265/30R1925.26 in × 10.43 in225/30R2025.31 in × 8.86 in
Side profile and tread width, drawn to the same scale.
265/30R19 vs 225/30R20 differences
Measurement265/30R19225/30R20Difference% diff
Overall diameter25.26 in (641.6 mm)25.31 in (643.0 mm)+0.06 in (+1.4 mm)+0.22%
Sidewall height3.13 in (79.5 mm)2.66 in (67.5 mm)−0.47 in (−12.0 mm)−15.09%
Section width10.43 in (265.0 mm)8.86 in (225.0 mm)−1.57 in (−40.0 mm)−15.09%
Circumference79.36 in (2,015.6 mm)79.53 in (2,020.0 mm)+0.17 in (+4.4 mm)+0.22%
Revolutions per mile798797−2−0.22%
True speed with the speedometer calibrated for 265/30R19
IndicatedActual on 265/30R19Actual on 225/30R20Difference
30 mph30.0 mph30.1 mph+0.1 mph
60 mph60.0 mph60.1 mph+0.1 mph
75 mph75.0 mph75.2 mph+0.2 mph

Ride-height change: 225/30R20 raises the vehicle by 0.03 in (0.7 mm) at the axle (half the +1.4 mm diameter difference).

225/30R20 is 0.06 in taller than 265/30R19 and 40 mm narrower, a 0.22% difference in overall diameter.

With the speedometer calibrated for 265/30R19, an indicated 60 mph is actually 60.1 mph on 225/30R20, and revolutions per mile change from 798 to 797.

225/30R20 mounts on a 20-inch wheel, a plus-1 fitment from the 19-inch wheel of 265/30R19.

Size pages

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