215/50R18 vs 265/35R19

265/35R19 is 0.16 in (4.1 mm) shorter than 215/50R18, a −0.61% diameter difference. With the speedometer set for 215/50R18, an indicated 60 mph is 59.6 mph on 265/35R19.

Is this a safe swap?

Diameter difference −0.61%: under 1%

By overall diameter alone, 265/35R19 is a near match for 215/50R18; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

Side profile and tread width, drawn to the same scale.

215/50R18 vs 265/35R19 differences
Measurement	215/50R18	265/35R19	Difference	% diff
Overall diameter	26.46 in (672.2 mm)	26.30 in (668.1 mm)	−0.16 in (−4.1 mm)	−0.61%
Sidewall height	4.23 in (107.5 mm)	3.65 in (92.8 mm)	−0.58 in (−14.7 mm)	−13.72%
Section width	8.46 in (215.0 mm)	10.43 in (265.0 mm)	+1.97 in (+50.0 mm)	+23.26%
Circumference	83.14 in (2,111.8 mm)	82.63 in (2,098.9 mm)	−0.51 in (−12.9 mm)	−0.61%
Revolutions per mile	762	767	+5	+0.61%

True speed with the speedometer calibrated for 215/50R18
Indicated	Actual on 215/50R18	Actual on 265/35R19	Difference
30 mph	30.0 mph	29.8 mph	−0.2 mph
60 mph	60.0 mph	59.6 mph	−0.4 mph
75 mph	75.0 mph	74.5 mph	−0.5 mph

Ride-height change: 265/35R19 lowers the vehicle by 0.08 in (2.1 mm) at the axle (half the −4.1 mm diameter difference).

265/35R19 is 0.16 in shorter than 215/50R18 and 50 mm wider, a 0.61% difference in overall diameter.

With the speedometer calibrated for 215/50R18, an indicated 60 mph is actually 59.6 mph on 265/35R19, and revolutions per mile change from 762 to 767.

265/35R19 mounts on a 19-inch wheel, a plus-1 fitment from the 18-inch wheel of 215/50R18.

Size pages

Other comparisons with 215/50R18

Other comparisons with 265/35R19

Source: Calculated from standard tire geometry formulas. Verified 2026-09-27. How these numbers are calculated.