205/50R17 vs 265/30R19

265/30R19 is 0.19 in (4.8 mm) taller than 205/50R17, a +0.75% diameter difference. With the speedometer set for 205/50R17, an indicated 60 mph is 60.5 mph on 265/30R19.

Is this a safe swap?

Diameter difference +0.75%: under 1%

By overall diameter alone, 265/30R19 is a near match for 205/50R17; 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.

205/50R17 vs 265/30R19 differences
Measurement	205/50R17	265/30R19	Difference	% diff
Overall diameter	25.07 in (636.8 mm)	25.26 in (641.6 mm)	+0.19 in (+4.8 mm)	+0.75%
Sidewall height	4.04 in (102.5 mm)	3.13 in (79.5 mm)	−0.91 in (−23.0 mm)	−22.44%
Section width	8.07 in (205.0 mm)	10.43 in (265.0 mm)	+2.36 in (+60.0 mm)	+29.27%
Circumference	78.76 in (2,000.6 mm)	79.36 in (2,015.6 mm)	+0.59 in (+15.1 mm)	+0.75%
Revolutions per mile	804	798	−6	−0.75%

True speed with the speedometer calibrated for 205/50R17
Indicated	Actual on 205/50R17	Actual on 265/30R19	Difference
30 mph	30.0 mph	30.2 mph	+0.2 mph
60 mph	60.0 mph	60.5 mph	+0.5 mph
75 mph	75.0 mph	75.6 mph	+0.6 mph

Ride-height change: 265/30R19 raises the vehicle by 0.09 in (2.4 mm) at the axle (half the +4.8 mm diameter difference).

265/30R19 is 0.19 in taller than 205/50R17 and 60 mm wider, a 0.75% difference in overall diameter.

With the speedometer calibrated for 205/50R17, an indicated 60 mph is actually 60.5 mph on 265/30R19, and revolutions per mile change from 804 to 798.

265/30R19 mounts on a 19-inch wheel, a plus-2 fitment from the 17-inch wheel of 205/50R17.

Size pages

Other comparisons with 205/50R17

Other comparisons with 265/30R19

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