235/55R19 vs 265/50R19

265/50R19 is 0.26 in (6.5 mm) taller than 235/55R19, a +0.88% diameter difference. With the speedometer set for 235/55R19, an indicated 60 mph is 60.5 mph on 265/50R19.

Is this a safe swap?

Diameter difference +0.88%: under 1%

By overall diameter alone, 265/50R19 is a near match for 235/55R19; 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.

235/55R19 vs 265/50R19 differences
Measurement	235/55R19	265/50R19	Difference	% diff
Overall diameter	29.18 in (741.1 mm)	29.43 in (747.6 mm)	+0.26 in (+6.5 mm)	+0.88%
Sidewall height	5.09 in (129.3 mm)	5.22 in (132.5 mm)	+0.13 in (+3.3 mm)	+2.51%
Section width	9.25 in (235.0 mm)	10.43 in (265.0 mm)	+1.18 in (+30.0 mm)	+12.77%
Circumference	91.66 in (2,328.2 mm)	92.47 in (2,348.7 mm)	+0.80 in (+20.4 mm)	+0.88%
Revolutions per mile	691	685	−6	−0.87%

True speed with the speedometer calibrated for 235/55R19
Indicated	Actual on 235/55R19	Actual on 265/50R19	Difference
30 mph	30.0 mph	30.3 mph	+0.3 mph
60 mph	60.0 mph	60.5 mph	+0.5 mph
75 mph	75.0 mph	75.7 mph	+0.7 mph

Ride-height change: 265/50R19 raises the vehicle by 0.13 in (3.3 mm) at the axle (half the +6.5 mm diameter difference).

265/50R19 is 0.26 in taller than 235/55R19 and 30 mm wider, a 0.88% difference in overall diameter.

With the speedometer calibrated for 235/55R19, an indicated 60 mph is actually 60.5 mph on 265/50R19, and revolutions per mile change from 691 to 685.

Both sizes mount on 19-inch wheels.

Size pages

Other comparisons with 235/55R19

Other comparisons with 265/50R19

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