255/55R19 vs 235/60R19

235/60R19 is 0.06 in (1.5 mm) taller than 255/55R19, a +0.20% diameter difference. With the speedometer set for 255/55R19, an indicated 60 mph is 60.1 mph on 235/60R19.

Is this a safe swap?

Diameter difference +0.20%: under 1%

By overall diameter alone, 235/60R19 is a near match for 255/55R19; 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.

255/55R19 vs 235/60R19 differences
Measurement	255/55R19	235/60R19	Difference	% diff
Overall diameter	30.04 in (763.1 mm)	30.10 in (764.6 mm)	+0.06 in (+1.5 mm)	+0.20%
Sidewall height	5.52 in (140.3 mm)	5.55 in (141.0 mm)	+0.03 in (+0.8 mm)	+0.53%
Section width	10.04 in (255.0 mm)	9.25 in (235.0 mm)	−0.79 in (−20.0 mm)	−7.84%
Circumference	94.38 in (2,397.3 mm)	94.57 in (2,402.1 mm)	+0.19 in (+4.7 mm)	+0.20%
Revolutions per mile	671	670	−1	−0.20%

True speed with the speedometer calibrated for 255/55R19
Indicated	Actual on 255/55R19	Actual on 235/60R19	Difference
30 mph	30.0 mph	30.1 mph	+0.1 mph
60 mph	60.0 mph	60.1 mph	+0.1 mph
75 mph	75.0 mph	75.1 mph	+0.1 mph

Ride-height change: 235/60R19 raises the vehicle by 0.03 in (0.8 mm) at the axle (half the +1.5 mm diameter difference).

235/60R19 is 0.06 in taller than 255/55R19 and 20 mm narrower, a 0.20% difference in overall diameter.

With the speedometer calibrated for 255/55R19, an indicated 60 mph is actually 60.1 mph on 235/60R19, and revolutions per mile change from 671 to 670.

Both sizes mount on 19-inch wheels.

Size pages

Other comparisons with 255/55R19

Other comparisons with 235/60R19

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