195/70R15 vs 205/70R15

205/70R15 is 0.55 in (14.0 mm) taller than 195/70R15, a +2.14% diameter difference. With the speedometer set for 195/70R15, an indicated 60 mph is 61.3 mph on 205/70R15.

Is this a safe swap?

Diameter difference +2.14%: within the ±3% guideline

By overall diameter alone, 205/70R15 falls inside the ±3% range commonly used as a guideline when replacing 195/70R15. 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.

195/70R15 vs 205/70R15 differences
Measurement	195/70R15	205/70R15	Difference	% diff
Overall diameter	25.75 in (654.0 mm)	26.30 in (668.0 mm)	+0.55 in (+14.0 mm)	+2.14%
Sidewall height	5.37 in (136.5 mm)	5.65 in (143.5 mm)	+0.28 in (+7.0 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	80.89 in (2,054.6 mm)	82.62 in (2,098.6 mm)	+1.73 in (+44.0 mm)	+2.14%
Revolutions per mile	783	767	−16	−2.10%

True speed with the speedometer calibrated for 195/70R15
Indicated	Actual on 195/70R15	Actual on 205/70R15	Difference
30 mph	30.0 mph	30.6 mph	+0.6 mph
60 mph	60.0 mph	61.3 mph	+1.3 mph
75 mph	75.0 mph	76.6 mph	+1.6 mph

Ride-height change: 205/70R15 raises the vehicle by 0.28 in (7.0 mm) at the axle (half the +14.0 mm diameter difference).

205/70R15 is 0.55 in taller than 195/70R15 and 10 mm wider, a 2.14% difference in overall diameter.

With the speedometer calibrated for 195/70R15, an indicated 60 mph is actually 61.3 mph on 205/70R15, and revolutions per mile change from 783 to 767.

Both sizes mount on 15-inch wheels.

Size pages

Other comparisons with 195/70R15

Other comparisons with 205/70R15

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