TireSizesFinder

155/80R14 vs 215/50R15

215/50R15 is 0.30 in (7.6 mm) shorter than 155/80R14, a −1.26% diameter difference. With the speedometer set for 155/80R14, an indicated 60 mph is 59.2 mph on 215/50R15.

Is this a safe swap?

Diameter difference −1.26%: within the ±3% guideline

By overall diameter alone, 215/50R15 falls inside the ±3% range commonly used as a guideline when replacing 155/80R14. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 155/80R14 (23.76 in) vs 215/50R15 (23.46 in)155/80R1423.76 in × 6.10 in215/50R1523.46 in × 8.46 in
Side profile and tread width, drawn to the same scale.
155/80R14 vs 215/50R15 differences
Measurement155/80R14215/50R15Difference% diff
Overall diameter23.76 in (603.6 mm)23.46 in (596.0 mm)−0.30 in (−7.6 mm)−1.26%
Sidewall height4.88 in (124.0 mm)4.23 in (107.5 mm)−0.65 in (−16.5 mm)−13.31%
Section width6.10 in (155.0 mm)8.46 in (215.0 mm)+2.36 in (+60.0 mm)+38.71%
Circumference74.66 in (1,896.3 mm)73.72 in (1,872.4 mm)−0.94 in (−23.9 mm)−1.26%
Revolutions per mile849860+11+1.28%
True speed with the speedometer calibrated for 155/80R14
IndicatedActual on 155/80R14Actual on 215/50R15Difference
30 mph30.0 mph29.6 mph−0.4 mph
60 mph60.0 mph59.2 mph−0.8 mph
75 mph75.0 mph74.1 mph−0.9 mph

Ride-height change: 215/50R15 lowers the vehicle by 0.15 in (3.8 mm) at the axle (half the −7.6 mm diameter difference).

215/50R15 is 0.30 in shorter than 155/80R14 and 60 mm wider, a 1.26% difference in overall diameter.

With the speedometer calibrated for 155/80R14, an indicated 60 mph is actually 59.2 mph on 215/50R15, and revolutions per mile change from 849 to 860.

215/50R15 mounts on a 15-inch wheel, a plus-1 fitment from the 14-inch wheel of 155/80R14.

Size pages

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