TireSizesFinder

265/55R19 vs 245/55R20

245/55R20 is 0.13 in (3.4 mm) taller than 265/55R19, a +0.44% diameter difference. With the speedometer set for 265/55R19, an indicated 60 mph is 60.3 mph on 245/55R20.

Is this a safe swap?

Diameter difference +0.44%: under 1%

By overall diameter alone, 245/55R20 is a near match for 265/55R19; 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: 265/55R19 (30.48 in) vs 245/55R20 (30.61 in)265/55R1930.48 in × 10.43 in245/55R2030.61 in × 9.65 in
Side profile and tread width, drawn to the same scale.
265/55R19 vs 245/55R20 differences
Measurement265/55R19245/55R20Difference% diff
Overall diameter30.48 in (774.1 mm)30.61 in (777.5 mm)+0.13 in (+3.4 mm)+0.44%
Sidewall height5.74 in (145.8 mm)5.31 in (134.8 mm)−0.43 in (−11.0 mm)−7.55%
Section width10.43 in (265.0 mm)9.65 in (245.0 mm)−0.79 in (−20.0 mm)−7.55%
Circumference95.74 in (2,431.9 mm)96.16 in (2,442.6 mm)+0.42 in (+10.7 mm)+0.44%
Revolutions per mile662659−3−0.44%
True speed with the speedometer calibrated for 265/55R19
IndicatedActual on 265/55R19Actual on 245/55R20Difference
30 mph30.0 mph30.1 mph+0.1 mph
60 mph60.0 mph60.3 mph+0.3 mph
75 mph75.0 mph75.3 mph+0.3 mph

Ride-height change: 245/55R20 raises the vehicle by 0.07 in (1.7 mm) at the axle (half the +3.4 mm diameter difference).

245/55R20 is 0.13 in taller than 265/55R19 and 20 mm narrower, a 0.44% difference in overall diameter.

With the speedometer calibrated for 265/55R19, an indicated 60 mph is actually 60.3 mph on 245/55R20, and revolutions per mile change from 662 to 659.

245/55R20 mounts on a 20-inch wheel, a plus-1 fitment from the 19-inch wheel of 265/55R19.

Size pages

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