245/50R19 vs 265/50R19

265/50R19 is 0.79 in (20.0 mm) taller than 245/50R19, a +2.75% diameter difference. With the speedometer set for 245/50R19, an indicated 60 mph is 61.6 mph on 265/50R19.

Is this a safe swap?

Diameter difference +2.75%: within the ±3% guideline

By overall diameter alone, 265/50R19 falls inside the ±3% range commonly used as a guideline when replacing 245/50R19. 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.

245/50R19 vs 265/50R19 differences
Measurement	245/50R19	265/50R19	Difference	% diff
Overall diameter	28.65 in (727.6 mm)	29.43 in (747.6 mm)	+0.79 in (+20.0 mm)	+2.75%
Sidewall height	4.82 in (122.5 mm)	5.22 in (132.5 mm)	+0.39 in (+10.0 mm)	+8.16%
Section width	9.65 in (245.0 mm)	10.43 in (265.0 mm)	+0.79 in (+20.0 mm)	+8.16%
Circumference	89.99 in (2,285.8 mm)	92.47 in (2,348.7 mm)	+2.47 in (+62.8 mm)	+2.75%
Revolutions per mile	704	685	−19	−2.68%

True speed with the speedometer calibrated for 245/50R19
Indicated	Actual on 245/50R19	Actual on 265/50R19	Difference
30 mph	30.0 mph	30.8 mph	+0.8 mph
60 mph	60.0 mph	61.6 mph	+1.6 mph
75 mph	75.0 mph	77.1 mph	+2.1 mph

Ride-height change: 265/50R19 raises the vehicle by 0.39 in (10.0 mm) at the axle (half the +20.0 mm diameter difference).

265/50R19 is 0.79 in taller than 245/50R19 and 20 mm wider, a 2.75% difference in overall diameter.

With the speedometer calibrated for 245/50R19, an indicated 60 mph is actually 61.6 mph on 265/50R19, and revolutions per mile change from 704 to 685.

Both sizes mount on 19-inch wheels.

Size pages

Other comparisons with 245/50R19

Other comparisons with 265/50R19

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