235/50R19 vs 245/50R19

245/50R19 is 0.39 in (10.0 mm) taller than 235/50R19, a +1.39% diameter difference. With the speedometer set for 235/50R19, an indicated 60 mph is 60.8 mph on 245/50R19.

Is this a safe swap?

Diameter difference +1.39%: within the ±3% guideline

By overall diameter alone, 245/50R19 falls inside the ±3% range commonly used as a guideline when replacing 235/50R19. 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.

235/50R19 vs 245/50R19 differences
Measurement	235/50R19	245/50R19	Difference	% diff
Overall diameter	28.25 in (717.6 mm)	28.65 in (727.6 mm)	+0.39 in (+10.0 mm)	+1.39%
Sidewall height	4.63 in (117.5 mm)	4.82 in (122.5 mm)	+0.20 in (+5.0 mm)	+4.26%
Section width	9.25 in (235.0 mm)	9.65 in (245.0 mm)	+0.39 in (+10.0 mm)	+4.26%
Circumference	88.76 in (2,254.4 mm)	89.99 in (2,285.8 mm)	+1.24 in (+31.4 mm)	+1.39%
Revolutions per mile	714	704	−10	−1.37%

True speed with the speedometer calibrated for 235/50R19
Indicated	Actual on 235/50R19	Actual on 245/50R19	Difference
30 mph	30.0 mph	30.4 mph	+0.4 mph
60 mph	60.0 mph	60.8 mph	+0.8 mph
75 mph	75.0 mph	76.0 mph	+1.0 mph

Ride-height change: 245/50R19 raises the vehicle by 0.20 in (5.0 mm) at the axle (half the +10.0 mm diameter difference).

245/50R19 is 0.39 in taller than 235/50R19 and 10 mm wider, a 1.39% difference in overall diameter.

With the speedometer calibrated for 235/50R19, an indicated 60 mph is actually 60.8 mph on 245/50R19, and revolutions per mile change from 714 to 704.

Both sizes mount on 19-inch wheels.

Size pages

Other comparisons with 235/50R19

Other comparisons with 245/50R19

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