TireSizesFinder

235/45R19 vs 265/35R20

265/35R20 is 0.02 in (0.6 mm) shorter than 235/45R19, a −0.09% diameter difference. With the speedometer set for 235/45R19, an indicated 60 mph is 59.9 mph on 265/35R20.

Is this a safe swap?

Diameter difference −0.09%: under 1%

By overall diameter alone, 265/35R20 is a near match for 235/45R19; 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: 235/45R19 (27.33 in) vs 265/35R20 (27.30 in)235/45R1927.33 in × 9.25 in265/35R2027.30 in × 10.43 in
Side profile and tread width, drawn to the same scale.
235/45R19 vs 265/35R20 differences
Measurement235/45R19265/35R20Difference% diff
Overall diameter27.33 in (694.1 mm)27.30 in (693.5 mm)−0.02 in (−0.6 mm)−0.09%
Sidewall height4.16 in (105.8 mm)3.65 in (92.8 mm)−0.51 in (−13.0 mm)−12.29%
Section width9.25 in (235.0 mm)10.43 in (265.0 mm)+1.18 in (+30.0 mm)+12.77%
Circumference85.85 in (2,180.6 mm)85.78 in (2,178.7 mm)−0.07 in (−1.9 mm)−0.09%
Revolutions per mile738739+1+0.09%
True speed with the speedometer calibrated for 235/45R19
IndicatedActual on 235/45R19Actual on 265/35R20Difference
30 mph30.0 mph30.0 mph0.0 mph
60 mph60.0 mph59.9 mph−0.1 mph
75 mph75.0 mph74.9 mph−0.1 mph

Ride-height change: 265/35R20 lowers the vehicle by 0.01 in (0.3 mm) at the axle (half the −0.6 mm diameter difference).

265/35R20 is 0.02 in shorter than 235/45R19 and 30 mm wider, a 0.09% difference in overall diameter.

With the speedometer calibrated for 235/45R19, an indicated 60 mph is actually 59.9 mph on 265/35R20, and revolutions per mile change from 738 to 739.

265/35R20 mounts on a 20-inch wheel, a plus-1 fitment from the 19-inch wheel of 235/45R19.

Size pages

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