TireSizesFinder

175/60R15 vs 205/40R17

205/40R17 is 0.19 in (4.8 mm) taller than 175/60R15, a +0.81% diameter difference. With the speedometer set for 175/60R15, an indicated 60 mph is 60.5 mph on 205/40R17.

Is this a safe swap?

Diameter difference +0.81%: under 1%

By overall diameter alone, 205/40R17 is a near match for 175/60R15; 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: 175/60R15 (23.27 in) vs 205/40R17 (23.46 in)175/60R1523.27 in × 6.89 in205/40R1723.46 in × 8.07 in
Side profile and tread width, drawn to the same scale.
175/60R15 vs 205/40R17 differences
Measurement175/60R15205/40R17Difference% diff
Overall diameter23.27 in (591.0 mm)23.46 in (595.8 mm)+0.19 in (+4.8 mm)+0.81%
Sidewall height4.13 in (105.0 mm)3.23 in (82.0 mm)−0.91 in (−23.0 mm)−21.90%
Section width6.89 in (175.0 mm)8.07 in (205.0 mm)+1.18 in (+30.0 mm)+17.14%
Circumference73.10 in (1,856.7 mm)73.69 in (1,871.8 mm)+0.59 in (+15.1 mm)+0.81%
Revolutions per mile867860−7−0.81%
True speed with the speedometer calibrated for 175/60R15
IndicatedActual on 175/60R15Actual on 205/40R17Difference
30 mph30.0 mph30.2 mph+0.2 mph
60 mph60.0 mph60.5 mph+0.5 mph
75 mph75.0 mph75.6 mph+0.6 mph

Ride-height change: 205/40R17 raises the vehicle by 0.09 in (2.4 mm) at the axle (half the +4.8 mm diameter difference).

205/40R17 is 0.19 in taller than 175/60R15 and 30 mm wider, a 0.81% difference in overall diameter.

With the speedometer calibrated for 175/60R15, an indicated 60 mph is actually 60.5 mph on 205/40R17, and revolutions per mile change from 867 to 860.

205/40R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 175/60R15.

Size pages

Other comparisons with 175/60R15

Other comparisons with 205/40R17

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