255/45R17 vs 265/35R19

265/35R19 is 0.27 in (6.8 mm) taller than 255/45R17, a +1.03% diameter difference. With the speedometer set for 255/45R17, an indicated 60 mph is 60.6 mph on 265/35R19.

Is this a safe swap?

Diameter difference +1.03%: within the ±3% guideline

By overall diameter alone, 265/35R19 falls inside the ±3% range commonly used as a guideline when replacing 255/45R17. 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.

255/45R17 vs 265/35R19 differences
Measurement	255/45R17	265/35R19	Difference	% diff
Overall diameter	26.04 in (661.3 mm)	26.30 in (668.1 mm)	+0.27 in (+6.8 mm)	+1.03%
Sidewall height	4.52 in (114.8 mm)	3.65 in (92.8 mm)	−0.87 in (−22.0 mm)	−19.17%
Section width	10.04 in (255.0 mm)	10.43 in (265.0 mm)	+0.39 in (+10.0 mm)	+3.92%
Circumference	81.79 in (2,077.5 mm)	82.63 in (2,098.9 mm)	+0.84 in (+21.4 mm)	+1.03%
Revolutions per mile	775	767	−8	−1.02%

True speed with the speedometer calibrated for 255/45R17
Indicated	Actual on 255/45R17	Actual on 265/35R19	Difference
30 mph	30.0 mph	30.3 mph	+0.3 mph
60 mph	60.0 mph	60.6 mph	+0.6 mph
75 mph	75.0 mph	75.8 mph	+0.8 mph

Ride-height change: 265/35R19 raises the vehicle by 0.13 in (3.4 mm) at the axle (half the +6.8 mm diameter difference).

265/35R19 is 0.27 in taller than 255/45R17 and 10 mm wider, a 1.03% difference in overall diameter.

With the speedometer calibrated for 255/45R17, an indicated 60 mph is actually 60.6 mph on 265/35R19, and revolutions per mile change from 775 to 767.

265/35R19 mounts on a 19-inch wheel, a plus-2 fitment from the 17-inch wheel of 255/45R17.

Size pages

Other comparisons with 255/45R17

Other comparisons with 265/35R19

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