195/65R15 vs 205/65R15

205/65R15 is 0.51 in (13.0 mm) taller than 195/65R15, a +2.05% diameter difference. With the speedometer set for 195/65R15, an indicated 60 mph is 61.2 mph on 205/65R15.

Is this a safe swap?

Diameter difference +2.05%: within the ±3% guideline

By overall diameter alone, 205/65R15 falls inside the ±3% range commonly used as a guideline when replacing 195/65R15. 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.

195/65R15 vs 205/65R15 differences
Measurement	195/65R15	205/65R15	Difference	% diff
Overall diameter	24.98 in (634.5 mm)	25.49 in (647.5 mm)	+0.51 in (+13.0 mm)	+2.05%
Sidewall height	4.99 in (126.8 mm)	5.25 in (133.3 mm)	+0.26 in (+6.5 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	78.48 in (1,993.3 mm)	80.09 in (2,034.2 mm)	+1.61 in (+40.8 mm)	+2.05%
Revolutions per mile	807	791	−16	−2.01%

True speed with the speedometer calibrated for 195/65R15
Indicated	Actual on 195/65R15	Actual on 205/65R15	Difference
30 mph	30.0 mph	30.6 mph	+0.6 mph
60 mph	60.0 mph	61.2 mph	+1.2 mph
75 mph	75.0 mph	76.5 mph	+1.5 mph

Ride-height change: 205/65R15 raises the vehicle by 0.26 in (6.5 mm) at the axle (half the +13.0 mm diameter difference).

205/65R15 is 0.51 in taller than 195/65R15 and 10 mm wider, a 2.05% difference in overall diameter.

With the speedometer calibrated for 195/65R15, an indicated 60 mph is actually 61.2 mph on 205/65R15, and revolutions per mile change from 807 to 791.

Both sizes mount on 15-inch wheels.

Size pages

Other comparisons with 195/65R15

Other comparisons with 205/65R15

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