TireSizesFinder

195/70R15 vs 215/50R17

215/50R17 is 0.28 in (7.2 mm) shorter than 195/70R15, a −1.10% diameter difference. With the speedometer set for 195/70R15, an indicated 60 mph is 59.3 mph on 215/50R17.

Is this a safe swap?

Diameter difference −1.10%: within the ±3% guideline

By overall diameter alone, 215/50R17 falls inside the ±3% range commonly used as a guideline when replacing 195/70R15. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 195/70R15 (25.75 in) vs 215/50R17 (25.46 in)195/70R1525.75 in × 7.68 in215/50R1725.46 in × 8.46 in
Side profile and tread width, drawn to the same scale.
195/70R15 vs 215/50R17 differences
Measurement195/70R15215/50R17Difference% diff
Overall diameter25.75 in (654.0 mm)25.46 in (646.8 mm)−0.28 in (−7.2 mm)−1.10%
Sidewall height5.37 in (136.5 mm)4.23 in (107.5 mm)−1.14 in (−29.0 mm)−21.25%
Section width7.68 in (195.0 mm)8.46 in (215.0 mm)+0.79 in (+20.0 mm)+10.26%
Circumference80.89 in (2,054.6 mm)80.00 in (2,032.0 mm)−0.89 in (−22.6 mm)−1.10%
Revolutions per mile783792+9+1.11%
True speed with the speedometer calibrated for 195/70R15
IndicatedActual on 195/70R15Actual on 215/50R17Difference
30 mph30.0 mph29.7 mph−0.3 mph
60 mph60.0 mph59.3 mph−0.7 mph
75 mph75.0 mph74.2 mph−0.8 mph

Ride-height change: 215/50R17 lowers the vehicle by 0.14 in (3.6 mm) at the axle (half the −7.2 mm diameter difference).

215/50R17 is 0.28 in shorter than 195/70R15 and 20 mm wider, a 1.10% difference in overall diameter.

With the speedometer calibrated for 195/70R15, an indicated 60 mph is actually 59.3 mph on 215/50R17, and revolutions per mile change from 783 to 792.

215/50R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 195/70R15.

Size pages

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