TireSizesFinder

175/65R15 vs 195/45R17

195/45R17 is 0.05 in (1.2 mm) shorter than 175/65R15, a −0.20% diameter difference. With the speedometer set for 175/65R15, an indicated 60 mph is 59.9 mph on 195/45R17.

Is this a safe swap?

Diameter difference −0.20%: under 1%

By overall diameter alone, 195/45R17 is a near match for 175/65R15; 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: 175/65R15 (23.96 in) vs 195/45R17 (23.91 in)175/65R1523.96 in × 6.89 in195/45R1723.91 in × 7.68 in
Side profile and tread width, drawn to the same scale.
175/65R15 vs 195/45R17 differences
Measurement175/65R15195/45R17Difference% diff
Overall diameter23.96 in (608.5 mm)23.91 in (607.3 mm)−0.05 in (−1.2 mm)−0.20%
Sidewall height4.48 in (113.8 mm)3.45 in (87.8 mm)−1.02 in (−26.0 mm)−22.86%
Section width6.89 in (175.0 mm)7.68 in (195.0 mm)+0.79 in (+20.0 mm)+11.43%
Circumference75.26 in (1,911.7 mm)75.11 in (1,907.9 mm)−0.15 in (−3.8 mm)−0.20%
Revolutions per mile842844+2+0.20%
True speed with the speedometer calibrated for 175/65R15
IndicatedActual on 175/65R15Actual on 195/45R17Difference
30 mph30.0 mph29.9 mph−0.1 mph
60 mph60.0 mph59.9 mph−0.1 mph
75 mph75.0 mph74.9 mph−0.1 mph

Ride-height change: 195/45R17 lowers the vehicle by 0.02 in (0.6 mm) at the axle (half the −1.2 mm diameter difference).

195/45R17 is 0.05 in shorter than 175/65R15 and 20 mm wider, a 0.20% difference in overall diameter.

With the speedometer calibrated for 175/65R15, an indicated 60 mph is actually 59.9 mph on 195/45R17, and revolutions per mile change from 842 to 844.

195/45R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 175/65R15.

Size pages

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