TireSizesFinder

175/60R15 vs 165/65R15

165/65R15 is 0.18 in (4.5 mm) taller than 175/60R15, a +0.76% diameter difference. With the speedometer set for 175/60R15, an indicated 60 mph is 60.5 mph on 165/65R15.

Is this a safe swap?

Diameter difference +0.76%: under 1%

By overall diameter alone, 165/65R15 is a near match for 175/60R15; 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: 175/60R15 (23.27 in) vs 165/65R15 (23.44 in)175/60R1523.27 in × 6.89 in165/65R1523.44 in × 6.50 in
Side profile and tread width, drawn to the same scale.
175/60R15 vs 165/65R15 differences
Measurement175/60R15165/65R15Difference% diff
Overall diameter23.27 in (591.0 mm)23.44 in (595.5 mm)+0.18 in (+4.5 mm)+0.76%
Sidewall height4.13 in (105.0 mm)4.22 in (107.3 mm)+0.09 in (+2.3 mm)+2.14%
Section width6.89 in (175.0 mm)6.50 in (165.0 mm)−0.39 in (−10.0 mm)−5.71%
Circumference73.10 in (1,856.7 mm)73.65 in (1,870.8 mm)+0.56 in (+14.1 mm)+0.76%
Revolutions per mile867860−7−0.76%
True speed with the speedometer calibrated for 175/60R15
IndicatedActual on 175/60R15Actual on 165/65R15Difference
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: 165/65R15 raises the vehicle by 0.09 in (2.3 mm) at the axle (half the +4.5 mm diameter difference).

165/65R15 is 0.18 in taller than 175/60R15 and 10 mm narrower, a 0.76% difference in overall diameter.

With the speedometer calibrated for 175/60R15, an indicated 60 mph is actually 60.5 mph on 165/65R15, and revolutions per mile change from 867 to 860.

Both sizes mount on 15-inch wheels.

Size pages

Other comparisons with 175/60R15

Other comparisons with 165/65R15

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