TireSizesFinder

155/80R14 vs 175/65R15

175/65R15 is 0.19 in (4.9 mm) taller than 155/80R14, a +0.81% diameter difference. With the speedometer set for 155/80R14, an indicated 60 mph is 60.5 mph on 175/65R15.

Is this a safe swap?

Diameter difference +0.81%: under 1%

By overall diameter alone, 175/65R15 is a near match for 155/80R14; 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: 155/80R14 (23.76 in) vs 175/65R15 (23.96 in)155/80R1423.76 in × 6.10 in175/65R1523.96 in × 6.89 in
Side profile and tread width, drawn to the same scale.
155/80R14 vs 175/65R15 differences
Measurement155/80R14175/65R15Difference% diff
Overall diameter23.76 in (603.6 mm)23.96 in (608.5 mm)+0.19 in (+4.9 mm)+0.81%
Sidewall height4.88 in (124.0 mm)4.48 in (113.8 mm)−0.40 in (−10.2 mm)−8.27%
Section width6.10 in (155.0 mm)6.89 in (175.0 mm)+0.79 in (+20.0 mm)+12.90%
Circumference74.66 in (1,896.3 mm)75.26 in (1,911.7 mm)+0.61 in (+15.4 mm)+0.81%
Revolutions per mile849842−7−0.81%
True speed with the speedometer calibrated for 155/80R14
IndicatedActual on 155/80R14Actual on 175/65R15Difference
30 mph30.0 mph30.2 mph+0.2 mph
60 mph60.0 mph60.5 mph+0.5 mph
75 mph75.0 mph75.6 mph+0.6 mph

Ride-height change: 175/65R15 raises the vehicle by 0.10 in (2.5 mm) at the axle (half the +4.9 mm diameter difference).

175/65R15 is 0.19 in taller than 155/80R14 and 20 mm wider, a 0.81% difference in overall diameter.

With the speedometer calibrated for 155/80R14, an indicated 60 mph is actually 60.5 mph on 175/65R15, and revolutions per mile change from 849 to 842.

175/65R15 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.