195/50R15 vs 205/50R15

205/50R15 is 0.39 in (10.0 mm) taller than 195/50R15, a +1.74% diameter difference. With the speedometer set for 195/50R15, an indicated 60 mph is 61.0 mph on 205/50R15.

Is this a safe swap?

Diameter difference +1.74%: within the ±3% guideline

By overall diameter alone, 205/50R15 falls inside the ±3% range commonly used as a guideline when replacing 195/50R15. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

Side profile and tread width, drawn to the same scale.

195/50R15 vs 205/50R15 differences
Measurement	195/50R15	205/50R15	Difference	% diff
Overall diameter	22.68 in (576.0 mm)	23.07 in (586.0 mm)	+0.39 in (+10.0 mm)	+1.74%
Sidewall height	3.84 in (97.5 mm)	4.04 in (102.5 mm)	+0.20 in (+5.0 mm)	+5.13%
Section width	7.68 in (195.0 mm)	8.07 in (205.0 mm)	+0.39 in (+10.0 mm)	+5.13%
Circumference	71.24 in (1,809.6 mm)	72.48 in (1,841.0 mm)	+1.24 in (+31.4 mm)	+1.74%
Revolutions per mile	889	874	−15	−1.71%

True speed with the speedometer calibrated for 195/50R15
Indicated	Actual on 195/50R15	Actual on 205/50R15	Difference
30 mph	30.0 mph	30.5 mph	+0.5 mph
60 mph	60.0 mph	61.0 mph	+1.0 mph
75 mph	75.0 mph	76.3 mph	+1.3 mph

Ride-height change: 205/50R15 raises the vehicle by 0.20 in (5.0 mm) at the axle (half the +10.0 mm diameter difference).

205/50R15 is 0.39 in taller than 195/50R15 and 10 mm wider, a 1.74% difference in overall diameter.

With the speedometer calibrated for 195/50R15, an indicated 60 mph is actually 61.0 mph on 205/50R15, and revolutions per mile change from 889 to 874.

Both sizes mount on 15-inch wheels.

Size pages

Other comparisons with 195/50R15

Other comparisons with 205/50R15

Source: Calculated from standard tire geometry formulas. Verified 2026-09-27. How these numbers are calculated.