TireSizesFinder

185/55R15 vs 195/55R15

195/55R15 is 0.43 in (11.0 mm) taller than 185/55R15, a +1.88% diameter difference. With the speedometer set for 185/55R15, an indicated 60 mph is 61.1 mph on 195/55R15.

Is this a safe swap?

Diameter difference +1.88%: within the ±3% guideline

By overall diameter alone, 195/55R15 falls inside the ±3% range commonly used as a guideline when replacing 185/55R15. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 185/55R15 (23.01 in) vs 195/55R15 (23.44 in)185/55R1523.01 in × 7.28 in195/55R1523.44 in × 7.68 in
Side profile and tread width, drawn to the same scale.
185/55R15 vs 195/55R15 differences
Measurement185/55R15195/55R15Difference% diff
Overall diameter23.01 in (584.5 mm)23.44 in (595.5 mm)+0.43 in (+11.0 mm)+1.88%
Sidewall height4.01 in (101.8 mm)4.22 in (107.3 mm)+0.22 in (+5.5 mm)+5.41%
Section width7.28 in (185.0 mm)7.68 in (195.0 mm)+0.39 in (+10.0 mm)+5.41%
Circumference72.29 in (1,836.3 mm)73.65 in (1,870.8 mm)+1.36 in (+34.6 mm)+1.88%
Revolutions per mile876860−16−1.85%
True speed with the speedometer calibrated for 185/55R15
IndicatedActual on 185/55R15Actual on 195/55R15Difference
30 mph30.0 mph30.6 mph+0.6 mph
60 mph60.0 mph61.1 mph+1.1 mph
75 mph75.0 mph76.4 mph+1.4 mph

Ride-height change: 195/55R15 raises the vehicle by 0.22 in (5.5 mm) at the axle (half the +11.0 mm diameter difference).

195/55R15 is 0.43 in taller than 185/55R15 and 10 mm wider, a 1.88% difference in overall diameter.

With the speedometer calibrated for 185/55R15, an indicated 60 mph is actually 61.1 mph on 195/55R15, and revolutions per mile change from 876 to 860.

Both sizes mount on 15-inch wheels.

Size pages

Other comparisons with 185/55R15

Other comparisons with 195/55R15

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