225/50R19 vs 245/50R19

245/50R19 is 0.79 in (20.0 mm) taller than 225/50R19, a +2.83% diameter difference. With the speedometer set for 225/50R19, an indicated 60 mph is 61.7 mph on 245/50R19.

Is this a safe swap?

Diameter difference +2.83%: within the ±3% guideline

By overall diameter alone, 245/50R19 falls inside the ±3% range commonly used as a guideline when replacing 225/50R19. 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.

225/50R19 vs 245/50R19 differences
Measurement	225/50R19	245/50R19	Difference	% diff
Overall diameter	27.86 in (707.6 mm)	28.65 in (727.6 mm)	+0.79 in (+20.0 mm)	+2.83%
Sidewall height	4.43 in (112.5 mm)	4.82 in (122.5 mm)	+0.39 in (+10.0 mm)	+8.89%
Section width	8.86 in (225.0 mm)	9.65 in (245.0 mm)	+0.79 in (+20.0 mm)	+8.89%
Circumference	87.52 in (2,223.0 mm)	89.99 in (2,285.8 mm)	+2.47 in (+62.8 mm)	+2.83%
Revolutions per mile	724	704	−20	−2.75%

True speed with the speedometer calibrated for 225/50R19
Indicated	Actual on 225/50R19	Actual on 245/50R19	Difference
30 mph	30.0 mph	30.8 mph	+0.8 mph
60 mph	60.0 mph	61.7 mph	+1.7 mph
75 mph	75.0 mph	77.1 mph	+2.1 mph

Ride-height change: 245/50R19 raises the vehicle by 0.39 in (10.0 mm) at the axle (half the +20.0 mm diameter difference).

245/50R19 is 0.79 in taller than 225/50R19 and 20 mm wider, a 2.83% difference in overall diameter.

With the speedometer calibrated for 225/50R19, an indicated 60 mph is actually 61.7 mph on 245/50R19, and revolutions per mile change from 724 to 704.

Both sizes mount on 19-inch wheels.

Size pages

Other comparisons with 225/50R19

Other comparisons with 245/50R19

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