TireSizesFinder

205/55R15 vs 195/45R17

195/45R17 is 0.03 in (0.8 mm) taller than 205/55R15, a +0.13% diameter difference. With the speedometer set for 205/55R15, an indicated 60 mph is 60.1 mph on 195/45R17.

Is this a safe swap?

Diameter difference +0.13%: under 1%

By overall diameter alone, 195/45R17 is a near match for 205/55R15; 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: 205/55R15 (23.88 in) vs 195/45R17 (23.91 in)205/55R1523.88 in × 8.07 in195/45R1723.91 in × 7.68 in
Side profile and tread width, drawn to the same scale.
205/55R15 vs 195/45R17 differences
Measurement205/55R15195/45R17Difference% diff
Overall diameter23.88 in (606.5 mm)23.91 in (607.3 mm)+0.03 in (+0.8 mm)+0.13%
Sidewall height4.44 in (112.8 mm)3.45 in (87.8 mm)−0.98 in (−25.0 mm)−22.17%
Section width8.07 in (205.0 mm)7.68 in (195.0 mm)−0.39 in (−10.0 mm)−4.88%
Circumference75.01 in (1,905.4 mm)75.11 in (1,907.9 mm)+0.10 in (+2.5 mm)+0.13%
Revolutions per mile845844−1−0.13%
True speed with the speedometer calibrated for 205/55R15
IndicatedActual on 205/55R15Actual on 195/45R17Difference
30 mph30.0 mph30.0 mph0.0 mph
60 mph60.0 mph60.1 mph+0.1 mph
75 mph75.0 mph75.1 mph+0.1 mph

Ride-height change: 195/45R17 raises the vehicle by 0.02 in (0.4 mm) at the axle (half the +0.8 mm diameter difference).

195/45R17 is 0.03 in taller than 205/55R15 and 10 mm narrower, a 0.13% difference in overall diameter.

With the speedometer calibrated for 205/55R15, 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 205/55R15.

Size pages

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