205/55R17 vs 245/35R19

245/35R19 is 0.13 in (3.2 mm) shorter than 205/55R17, a −0.49% diameter difference. With the speedometer set for 205/55R17, an indicated 60 mph is 59.7 mph on 245/35R19.

Is this a safe swap?

Diameter difference −0.49%: under 1%

By overall diameter alone, 245/35R19 is a near match for 205/55R17; 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.

205/55R17 vs 245/35R19 differences
Measurement	205/55R17	245/35R19	Difference	% diff
Overall diameter	25.88 in (657.3 mm)	25.75 in (654.1 mm)	−0.13 in (−3.2 mm)	−0.49%
Sidewall height	4.44 in (112.8 mm)	3.38 in (85.8 mm)	−1.06 in (−27.0 mm)	−23.95%
Section width	8.07 in (205.0 mm)	9.65 in (245.0 mm)	+1.57 in (+40.0 mm)	+19.51%
Circumference	81.30 in (2,065.0 mm)	80.90 in (2,054.9 mm)	−0.40 in (−10.1 mm)	−0.49%
Revolutions per mile	779	783	+4	+0.49%

True speed with the speedometer calibrated for 205/55R17
Indicated	Actual on 205/55R17	Actual on 245/35R19	Difference
30 mph	30.0 mph	29.9 mph	−0.1 mph
60 mph	60.0 mph	59.7 mph	−0.3 mph
75 mph	75.0 mph	74.6 mph	−0.4 mph

Ride-height change: 245/35R19 lowers the vehicle by 0.06 in (1.6 mm) at the axle (half the −3.2 mm diameter difference).

245/35R19 is 0.13 in shorter than 205/55R17 and 40 mm wider, a 0.49% difference in overall diameter.

With the speedometer calibrated for 205/55R17, an indicated 60 mph is actually 59.7 mph on 245/35R19, and revolutions per mile change from 779 to 783.

245/35R19 mounts on a 19-inch wheel, a plus-2 fitment from the 17-inch wheel of 205/55R17.

Size pages

Other comparisons with 205/55R17

Other comparisons with 245/35R19

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