195/60R15 vs 225/40R17

225/40R17 is 0.13 in (3.2 mm) shorter than 195/60R15, a −0.52% diameter difference. With the speedometer set for 195/60R15, an indicated 60 mph is 59.7 mph on 225/40R17.

Is this a safe swap?

Diameter difference −0.52%: under 1%

By overall diameter alone, 225/40R17 is a near match for 195/60R15; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

Side profile and tread width, drawn to the same scale.

195/60R15 vs 225/40R17 differences
Measurement	195/60R15	225/40R17	Difference	% diff
Overall diameter	24.21 in (615.0 mm)	24.09 in (611.8 mm)	−0.13 in (−3.2 mm)	−0.52%
Sidewall height	4.61 in (117.0 mm)	3.54 in (90.0 mm)	−1.06 in (−27.0 mm)	−23.08%
Section width	7.68 in (195.0 mm)	8.86 in (225.0 mm)	+1.18 in (+30.0 mm)	+15.38%
Circumference	76.07 in (1,932.1 mm)	75.67 in (1,922.0 mm)	−0.40 in (−10.1 mm)	−0.52%
Revolutions per mile	833	837	+4	+0.52%

True speed with the speedometer calibrated for 195/60R15
Indicated	Actual on 195/60R15	Actual on 225/40R17	Difference
30 mph	30.0 mph	29.8 mph	−0.2 mph
60 mph	60.0 mph	59.7 mph	−0.3 mph
75 mph	75.0 mph	74.6 mph	−0.4 mph

Ride-height change: 225/40R17 lowers the vehicle by 0.06 in (1.6 mm) at the axle (half the −3.2 mm diameter difference).

225/40R17 is 0.13 in shorter than 195/60R15 and 30 mm wider, a 0.52% difference in overall diameter.

With the speedometer calibrated for 195/60R15, an indicated 60 mph is actually 59.7 mph on 225/40R17, and revolutions per mile change from 833 to 837.

225/40R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 195/60R15.

Size pages

Other comparisons with 195/60R15

Other comparisons with 225/40R17

Source: Calculated from standard tire geometry formulas. Verified 2026-09-27. How these numbers are calculated.