TireSizesFinder

225/50R15 vs 195/45R17

195/45R17 is 0.05 in (1.3 mm) taller than 225/50R15, a +0.21% diameter difference. With the speedometer set for 225/50R15, an indicated 60 mph is 60.1 mph on 195/45R17.

Is this a safe swap?

Diameter difference +0.21%: under 1%

By overall diameter alone, 195/45R17 is a near match for 225/50R15; 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: 225/50R15 (23.86 in) vs 195/45R17 (23.91 in)225/50R1523.86 in × 8.86 in195/45R1723.91 in × 7.68 in
Side profile and tread width, drawn to the same scale.
225/50R15 vs 195/45R17 differences
Measurement225/50R15195/45R17Difference% diff
Overall diameter23.86 in (606.0 mm)23.91 in (607.3 mm)+0.05 in (+1.3 mm)+0.21%
Sidewall height4.43 in (112.5 mm)3.45 in (87.8 mm)−0.97 in (−24.7 mm)−22.00%
Section width8.86 in (225.0 mm)7.68 in (195.0 mm)−1.18 in (−30.0 mm)−13.33%
Circumference74.95 in (1,903.8 mm)75.11 in (1,907.9 mm)+0.16 in (+4.1 mm)+0.21%
Revolutions per mile845844−2−0.21%
True speed with the speedometer calibrated for 225/50R15
IndicatedActual on 225/50R15Actual on 195/45R17Difference
30 mph30.0 mph30.1 mph+0.1 mph
60 mph60.0 mph60.1 mph+0.1 mph
75 mph75.0 mph75.2 mph+0.2 mph

Ride-height change: 195/45R17 raises the vehicle by 0.03 in (0.6 mm) at the axle (half the +1.3 mm diameter difference).

195/45R17 is 0.05 in taller than 225/50R15 and 30 mm narrower, a 0.21% difference in overall diameter.

With the speedometer calibrated for 225/50R15, an indicated 60 mph is actually 60.1 mph on 195/45R17, and revolutions per mile change from 845 to 844.

195/45R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 225/50R15.

Size pages

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