TireSizesFinder

215/70R15 vs 225/55R17

225/55R17 is 0.11 in (2.7 mm) shorter than 215/70R15, a −0.40% diameter difference. With the speedometer set for 215/70R15, an indicated 60 mph is 59.8 mph on 225/55R17.

Is this a safe swap?

Diameter difference −0.40%: under 1%

By overall diameter alone, 225/55R17 is a near match for 215/70R15; 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: 215/70R15 (26.85 in) vs 225/55R17 (26.74 in)215/70R1526.85 in × 8.46 in225/55R1726.74 in × 8.86 in
Side profile and tread width, drawn to the same scale.
215/70R15 vs 225/55R17 differences
Measurement215/70R15225/55R17Difference% diff
Overall diameter26.85 in (682.0 mm)26.74 in (679.3 mm)−0.11 in (−2.7 mm)−0.40%
Sidewall height5.93 in (150.5 mm)4.87 in (123.8 mm)−1.05 in (−26.7 mm)−17.77%
Section width8.46 in (215.0 mm)8.86 in (225.0 mm)+0.39 in (+10.0 mm)+4.65%
Circumference84.35 in (2,142.6 mm)84.02 in (2,134.1 mm)−0.33 in (−8.5 mm)−0.40%
Revolutions per mile751754+3+0.40%
True speed with the speedometer calibrated for 215/70R15
IndicatedActual on 215/70R15Actual on 225/55R17Difference
30 mph30.0 mph29.9 mph−0.1 mph
60 mph60.0 mph59.8 mph−0.2 mph
75 mph75.0 mph74.7 mph−0.3 mph

Ride-height change: 225/55R17 lowers the vehicle by 0.05 in (1.4 mm) at the axle (half the −2.7 mm diameter difference).

225/55R17 is 0.11 in shorter than 215/70R15 and 10 mm wider, a 0.40% difference in overall diameter.

With the speedometer calibrated for 215/70R15, an indicated 60 mph is actually 59.8 mph on 225/55R17, and revolutions per mile change from 751 to 754.

225/55R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 215/70R15.

Size pages

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