TireSizesFinder

165/65R14 vs 205/50R15

205/50R15 is 0.63 in (15.9 mm) taller than 165/65R14, a +2.79% diameter difference. With the speedometer set for 165/65R14, an indicated 60 mph is 61.7 mph on 205/50R15.

Is this a safe swap?

Diameter difference +2.79%: within the ±3% guideline

By overall diameter alone, 205/50R15 falls inside the ±3% range commonly used as a guideline when replacing 165/65R14. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 165/65R14 (22.44 in) vs 205/50R15 (23.07 in)165/65R1422.44 in × 6.50 in205/50R1523.07 in × 8.07 in
Side profile and tread width, drawn to the same scale.
165/65R14 vs 205/50R15 differences
Measurement165/65R14205/50R15Difference% diff
Overall diameter22.44 in (570.1 mm)23.07 in (586.0 mm)+0.63 in (+15.9 mm)+2.79%
Sidewall height4.22 in (107.3 mm)4.04 in (102.5 mm)−0.19 in (−4.7 mm)−4.43%
Section width6.50 in (165.0 mm)8.07 in (205.0 mm)+1.57 in (+40.0 mm)+24.24%
Circumference70.51 in (1,791.0 mm)72.48 in (1,841.0 mm)+1.97 in (+50.0 mm)+2.79%
Revolutions per mile899874−24−2.71%
True speed with the speedometer calibrated for 165/65R14
IndicatedActual on 165/65R14Actual on 205/50R15Difference
30 mph30.0 mph30.8 mph+0.8 mph
60 mph60.0 mph61.7 mph+1.7 mph
75 mph75.0 mph77.1 mph+2.1 mph

Ride-height change: 205/50R15 raises the vehicle by 0.31 in (8.0 mm) at the axle (half the +15.9 mm diameter difference).

205/50R15 is 0.63 in taller than 165/65R14 and 40 mm wider, a 2.79% difference in overall diameter.

With the speedometer calibrated for 165/65R14, an indicated 60 mph is actually 61.7 mph on 205/50R15, and revolutions per mile change from 899 to 874.

205/50R15 mounts on a 15-inch wheel, a plus-1 fitment from the 14-inch wheel of 165/65R14.

Size pages

Other comparisons with 165/65R14

Other comparisons with 205/50R15

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