TireSizesFinder

265/35R19 vs 265/40R19

265/40R19 is 1.04 in (26.5 mm) taller than 265/35R19, a +3.97% diameter difference. With the speedometer set for 265/35R19, an indicated 60 mph is 62.4 mph on 265/40R19.

Is this a safe swap?

Diameter difference +3.97%: outside the ±3% guideline

By overall diameter alone, 265/40R19 falls outside the ±3% range commonly used as a guideline when replacing 265/35R19; speedometer and ride-height changes are larger. 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 265/40R19 (27.35 in)265/35R1926.30 in × 10.43 in265/40R1927.35 in × 10.43 in
Side profile and tread width, drawn to the same scale.
265/35R19 vs 265/40R19 differences
Measurement265/35R19265/40R19Difference% diff
Overall diameter26.30 in (668.1 mm)27.35 in (694.6 mm)+1.04 in (+26.5 mm)+3.97%
Sidewall height3.65 in (92.8 mm)4.17 in (106.0 mm)+0.52 in (+13.3 mm)+14.29%
Section width10.43 in (265.0 mm)10.43 in (265.0 mm)0.00 in (0.0 mm)0.00%
Circumference82.63 in (2,098.9 mm)85.91 in (2,182.2 mm)+3.28 in (+83.3 mm)+3.97%
Revolutions per mile767738−29−3.82%
True speed with the speedometer calibrated for 265/35R19
IndicatedActual on 265/35R19Actual on 265/40R19Difference
30 mph30.0 mph31.2 mph+1.2 mph
60 mph60.0 mph62.4 mph+2.4 mph
75 mph75.0 mph78.0 mph+3.0 mph

Ride-height change: 265/40R19 raises the vehicle by 0.52 in (13.3 mm) at the axle (half the +26.5 mm diameter difference).

265/40R19 is 1.04 in taller than 265/35R19 and the same width, a 3.97% difference in overall diameter.

With the speedometer calibrated for 265/35R19, an indicated 60 mph is actually 62.4 mph on 265/40R19, and revolutions per mile change from 767 to 738.

Both sizes mount on 19-inch wheels.

Size pages

Other comparisons with 265/35R19

Other comparisons with 265/40R19

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