TireSizesFinder

255/30R19 vs 265/30R19

265/30R19 is 0.24 in (6.0 mm) taller than 255/30R19, a +0.94% diameter difference. With the speedometer set for 255/30R19, an indicated 60 mph is 60.6 mph on 265/30R19.

Is this a safe swap?

Diameter difference +0.94%: under 1%

By overall diameter alone, 265/30R19 is a near match for 255/30R19; 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: 255/30R19 (25.02 in) vs 265/30R19 (25.26 in)255/30R1925.02 in × 10.04 in265/30R1925.26 in × 10.43 in
Side profile and tread width, drawn to the same scale.
255/30R19 vs 265/30R19 differences
Measurement255/30R19265/30R19Difference% diff
Overall diameter25.02 in (635.6 mm)25.26 in (641.6 mm)+0.24 in (+6.0 mm)+0.94%
Sidewall height3.01 in (76.5 mm)3.13 in (79.5 mm)+0.12 in (+3.0 mm)+3.92%
Section width10.04 in (255.0 mm)10.43 in (265.0 mm)+0.39 in (+10.0 mm)+3.92%
Circumference78.61 in (1,996.8 mm)79.36 in (2,015.6 mm)+0.74 in (+18.8 mm)+0.94%
Revolutions per mile806798−8−0.94%
True speed with the speedometer calibrated for 255/30R19
IndicatedActual on 255/30R19Actual on 265/30R19Difference
30 mph30.0 mph30.3 mph+0.3 mph
60 mph60.0 mph60.6 mph+0.6 mph
75 mph75.0 mph75.7 mph+0.7 mph

Ride-height change: 265/30R19 raises the vehicle by 0.12 in (3.0 mm) at the axle (half the +6.0 mm diameter difference).

265/30R19 is 0.24 in taller than 255/30R19 and 10 mm wider, a 0.94% difference in overall diameter.

With the speedometer calibrated for 255/30R19, an indicated 60 mph is actually 60.6 mph on 265/30R19, and revolutions per mile change from 806 to 798.

Both sizes mount on 19-inch wheels.

Size pages

Other comparisons with 255/30R19

Other comparisons with 265/30R19

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