TireSizesFinder

225/55R17 vs 225/45R19

225/45R19 is 0.23 in (5.8 mm) taller than 225/55R17, a +0.85% diameter difference. With the speedometer set for 225/55R17, an indicated 60 mph is 60.5 mph on 225/45R19.

Is this a safe swap?

Diameter difference +0.85%: under 1%

By overall diameter alone, 225/45R19 is a near match for 225/55R17; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 225/55R17 (26.74 in) vs 225/45R19 (26.97 in)225/55R1726.74 in × 8.86 in225/45R1926.97 in × 8.86 in
Side profile and tread width, drawn to the same scale.
225/55R17 vs 225/45R19 differences
Measurement225/55R17225/45R19Difference% diff
Overall diameter26.74 in (679.3 mm)26.97 in (685.1 mm)+0.23 in (+5.8 mm)+0.85%
Sidewall height4.87 in (123.8 mm)3.99 in (101.3 mm)−0.89 in (−22.5 mm)−18.18%
Section width8.86 in (225.0 mm)8.86 in (225.0 mm)0.00 in (0.0 mm)0.00%
Circumference84.02 in (2,134.1 mm)84.74 in (2,152.3 mm)+0.72 in (+18.2 mm)+0.85%
Revolutions per mile754748−6−0.85%
True speed with the speedometer calibrated for 225/55R17
IndicatedActual on 225/55R17Actual on 225/45R19Difference
30 mph30.0 mph30.3 mph+0.3 mph
60 mph60.0 mph60.5 mph+0.5 mph
75 mph75.0 mph75.6 mph+0.6 mph

Ride-height change: 225/45R19 raises the vehicle by 0.11 in (2.9 mm) at the axle (half the +5.8 mm diameter difference).

225/45R19 is 0.23 in taller than 225/55R17 and the same width, a 0.85% difference in overall diameter.

With the speedometer calibrated for 225/55R17, an indicated 60 mph is actually 60.5 mph on 225/45R19, and revolutions per mile change from 754 to 748.

225/45R19 mounts on a 19-inch wheel, a plus-2 fitment from the 17-inch wheel of 225/55R17.

Size pages

Other comparisons with 225/55R17

Other comparisons with 225/45R19

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