TireSizesFinder

235/70R15 vs 215/65R17

215/65R17 is 0.05 in (1.3 mm) taller than 235/70R15, a +0.18% diameter difference. With the speedometer set for 235/70R15, an indicated 60 mph is 60.1 mph on 215/65R17.

Is this a safe swap?

Diameter difference +0.18%: under 1%

By overall diameter alone, 215/65R17 is a near match for 235/70R15; 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: 235/70R15 (27.95 in) vs 215/65R17 (28.00 in)235/70R1527.95 in × 9.25 in215/65R1728.00 in × 8.46 in
Side profile and tread width, drawn to the same scale.
235/70R15 vs 215/65R17 differences
Measurement235/70R15215/65R17Difference% diff
Overall diameter27.95 in (710.0 mm)28.00 in (711.3 mm)+0.05 in (+1.3 mm)+0.18%
Sidewall height6.48 in (164.5 mm)5.50 in (139.8 mm)−0.97 in (−24.7 mm)−15.05%
Section width9.25 in (235.0 mm)8.46 in (215.0 mm)−0.79 in (−20.0 mm)−8.51%
Circumference87.82 in (2,230.5 mm)87.98 in (2,234.6 mm)+0.16 in (+4.1 mm)+0.18%
Revolutions per mile722720−1−0.18%
True speed with the speedometer calibrated for 235/70R15
IndicatedActual on 235/70R15Actual on 215/65R17Difference
30 mph30.0 mph30.1 mph+0.1 mph
60 mph60.0 mph60.1 mph+0.1 mph
75 mph75.0 mph75.1 mph+0.1 mph

Ride-height change: 215/65R17 raises the vehicle by 0.03 in (0.6 mm) at the axle (half the +1.3 mm diameter difference).

215/65R17 is 0.05 in taller than 235/70R15 and 20 mm narrower, a 0.18% difference in overall diameter.

With the speedometer calibrated for 235/70R15, an indicated 60 mph is actually 60.1 mph on 215/65R17, and revolutions per mile change from 722 to 720.

215/65R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 235/70R15.

Size pages

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