TireSizesFinder

215/70R15 vs 245/50R17

245/50R17 is 0.20 in (5.2 mm) shorter than 215/70R15, a −0.76% diameter difference. With the speedometer set for 215/70R15, an indicated 60 mph is 59.5 mph on 245/50R17.

Is this a safe swap?

Diameter difference −0.76%: under 1%

By overall diameter alone, 245/50R17 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 245/50R17 (26.65 in)215/70R1526.85 in × 8.46 in245/50R1726.65 in × 9.65 in
Side profile and tread width, drawn to the same scale.
215/70R15 vs 245/50R17 differences
Measurement215/70R15245/50R17Difference% diff
Overall diameter26.85 in (682.0 mm)26.65 in (676.8 mm)−0.20 in (−5.2 mm)−0.76%
Sidewall height5.93 in (150.5 mm)4.82 in (122.5 mm)−1.10 in (−28.0 mm)−18.60%
Section width8.46 in (215.0 mm)9.65 in (245.0 mm)+1.18 in (+30.0 mm)+13.95%
Circumference84.35 in (2,142.6 mm)83.71 in (2,126.2 mm)−0.64 in (−16.3 mm)−0.76%
Revolutions per mile751757+6+0.77%
True speed with the speedometer calibrated for 215/70R15
IndicatedActual on 215/70R15Actual on 245/50R17Difference
30 mph30.0 mph29.8 mph−0.2 mph
60 mph60.0 mph59.5 mph−0.5 mph
75 mph75.0 mph74.4 mph−0.6 mph

Ride-height change: 245/50R17 lowers the vehicle by 0.10 in (2.6 mm) at the axle (half the −5.2 mm diameter difference).

245/50R17 is 0.20 in shorter than 215/70R15 and 30 mm wider, a 0.76% difference in overall diameter.

With the speedometer calibrated for 215/70R15, an indicated 60 mph is actually 59.5 mph on 245/50R17, and revolutions per mile change from 751 to 757.

245/50R17 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.