TireSizesFinder

245/45R17 vs 285/30R19

285/30R19 is 0.05 in (1.3 mm) taller than 245/45R17, a +0.20% diameter difference. With the speedometer set for 245/45R17, an indicated 60 mph is 60.1 mph on 285/30R19.

Is this a safe swap?

Diameter difference +0.20%: under 1%

By overall diameter alone, 285/30R19 is a near match for 245/45R17; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 245/45R17 (25.68 in) vs 285/30R19 (25.73 in)245/45R1725.68 in × 9.65 in285/30R1925.73 in × 11.22 in
Side profile and tread width, drawn to the same scale.
245/45R17 vs 285/30R19 differences
Measurement245/45R17285/30R19Difference% diff
Overall diameter25.68 in (652.3 mm)25.73 in (653.6 mm)+0.05 in (+1.3 mm)+0.20%
Sidewall height4.34 in (110.3 mm)3.37 in (85.5 mm)−0.97 in (−24.7 mm)−22.45%
Section width9.65 in (245.0 mm)11.22 in (285.0 mm)+1.57 in (+40.0 mm)+16.33%
Circumference80.68 in (2,049.3 mm)80.84 in (2,053.3 mm)+0.16 in (+4.1 mm)+0.20%
Revolutions per mile785784−2−0.20%
True speed with the speedometer calibrated for 245/45R17
IndicatedActual on 245/45R17Actual on 285/30R19Difference
30 mph30.0 mph30.1 mph+0.1 mph
60 mph60.0 mph60.1 mph+0.1 mph
75 mph75.0 mph75.1 mph+0.1 mph

Ride-height change: 285/30R19 raises the vehicle by 0.03 in (0.6 mm) at the axle (half the +1.3 mm diameter difference).

285/30R19 is 0.05 in taller than 245/45R17 and 40 mm wider, a 0.20% difference in overall diameter.

With the speedometer calibrated for 245/45R17, an indicated 60 mph is actually 60.1 mph on 285/30R19, and revolutions per mile change from 785 to 784.

285/30R19 mounts on a 19-inch wheel, a plus-2 fitment from the 17-inch wheel of 245/45R17.

Size pages

Other comparisons with 245/45R17

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Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.