TireSizesFinder

265/35R19 vs 235/35R20

235/35R20 is 0.17 in (4.4 mm) taller than 265/35R19, a +0.66% diameter difference. With the speedometer set for 265/35R19, an indicated 60 mph is 60.4 mph on 235/35R20.

Is this a safe swap?

Diameter difference +0.66%: under 1%

By overall diameter alone, 235/35R20 is a near match for 265/35R19; 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: 265/35R19 (26.30 in) vs 235/35R20 (26.48 in)265/35R1926.30 in × 10.43 in235/35R2026.48 in × 9.25 in
Side profile and tread width, drawn to the same scale.
265/35R19 vs 235/35R20 differences
Measurement265/35R19235/35R20Difference% diff
Overall diameter26.30 in (668.1 mm)26.48 in (672.5 mm)+0.17 in (+4.4 mm)+0.66%
Sidewall height3.65 in (92.8 mm)3.24 in (82.3 mm)−0.41 in (−10.5 mm)−11.32%
Section width10.43 in (265.0 mm)9.25 in (235.0 mm)−1.18 in (−30.0 mm)−11.32%
Circumference82.63 in (2,098.9 mm)83.18 in (2,112.7 mm)+0.54 in (+13.8 mm)+0.66%
Revolutions per mile767762−5−0.65%
True speed with the speedometer calibrated for 265/35R19
IndicatedActual on 265/35R19Actual on 235/35R20Difference
30 mph30.0 mph30.2 mph+0.2 mph
60 mph60.0 mph60.4 mph+0.4 mph
75 mph75.0 mph75.5 mph+0.5 mph

Ride-height change: 235/35R20 raises the vehicle by 0.09 in (2.2 mm) at the axle (half the +4.4 mm diameter difference).

235/35R20 is 0.17 in taller than 265/35R19 and 30 mm narrower, a 0.66% difference in overall diameter.

With the speedometer calibrated for 265/35R19, an indicated 60 mph is actually 60.4 mph on 235/35R20, and revolutions per mile change from 767 to 762.

235/35R20 mounts on a 20-inch wheel, a plus-1 fitment from the 19-inch wheel of 265/35R19.

Size pages

Other comparisons with 265/35R19

Other comparisons with 235/35R20

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