TireSizesFinder

255/60R19 vs 265/55R20

265/55R20 is 0.43 in (10.9 mm) taller than 255/60R19, a +1.38% diameter difference. With the speedometer set for 255/60R19, an indicated 60 mph is 60.8 mph on 265/55R20.

Is this a safe swap?

Diameter difference +1.38%: within the ±3% guideline

By overall diameter alone, 265/55R20 falls inside the ±3% range commonly used as a guideline when replacing 255/60R19. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 255/60R19 (31.05 in) vs 265/55R20 (31.48 in)255/60R1931.05 in × 10.04 in265/55R2031.48 in × 10.43 in
Side profile and tread width, drawn to the same scale.
255/60R19 vs 265/55R20 differences
Measurement255/60R19265/55R20Difference% diff
Overall diameter31.05 in (788.6 mm)31.48 in (799.5 mm)+0.43 in (+10.9 mm)+1.38%
Sidewall height6.02 in (153.0 mm)5.74 in (145.8 mm)−0.29 in (−7.2 mm)−4.74%
Section width10.04 in (255.0 mm)10.43 in (265.0 mm)+0.39 in (+10.0 mm)+3.92%
Circumference97.54 in (2,477.5 mm)98.89 in (2,511.7 mm)+1.35 in (+34.2 mm)+1.38%
Revolutions per mile650641−9−1.36%
True speed with the speedometer calibrated for 255/60R19
IndicatedActual on 255/60R19Actual on 265/55R20Difference
30 mph30.0 mph30.4 mph+0.4 mph
60 mph60.0 mph60.8 mph+0.8 mph
75 mph75.0 mph76.0 mph+1.0 mph

Ride-height change: 265/55R20 raises the vehicle by 0.21 in (5.5 mm) at the axle (half the +10.9 mm diameter difference).

265/55R20 is 0.43 in taller than 255/60R19 and 10 mm wider, a 1.38% difference in overall diameter.

With the speedometer calibrated for 255/60R19, an indicated 60 mph is actually 60.8 mph on 265/55R20, and revolutions per mile change from 650 to 641.

265/55R20 mounts on a 20-inch wheel, a plus-1 fitment from the 19-inch wheel of 255/60R19.

Size pages

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