195/65R14 vs 185/70R14

185/70R14 is 0.22 in (5.5 mm) taller than 195/65R14, a +0.90% diameter difference. With the speedometer set for 195/65R14, an indicated 60 mph is 60.5 mph on 185/70R14.

Is this a safe swap?

Diameter difference +0.90%: under 1%

By overall diameter alone, 185/70R14 is a near match for 195/65R14; the speedometer changes by less than 1%. 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.

195/65R14 vs 185/70R14 differences
Measurement	195/65R14	185/70R14	Difference	% diff
Overall diameter	23.98 in (609.1 mm)	24.20 in (614.6 mm)	+0.22 in (+5.5 mm)	+0.90%
Sidewall height	4.99 in (126.8 mm)	5.10 in (129.5 mm)	+0.11 in (+2.8 mm)	+2.17%
Section width	7.68 in (195.0 mm)	7.28 in (185.0 mm)	−0.39 in (−10.0 mm)	−5.13%
Circumference	75.34 in (1,913.5 mm)	76.02 in (1,930.8 mm)	+0.68 in (+17.3 mm)	+0.90%
Revolutions per mile	841	834	−8	−0.89%

True speed with the speedometer calibrated for 195/65R14
Indicated	Actual on 195/65R14	Actual on 185/70R14	Difference
30 mph	30.0 mph	30.3 mph	+0.3 mph
60 mph	60.0 mph	60.5 mph	+0.5 mph
75 mph	75.0 mph	75.7 mph	+0.7 mph

Ride-height change: 185/70R14 raises the vehicle by 0.11 in (2.8 mm) at the axle (half the +5.5 mm diameter difference).

185/70R14 is 0.22 in taller than 195/65R14 and 10 mm narrower, a 0.90% difference in overall diameter.

With the speedometer calibrated for 195/65R14, an indicated 60 mph is actually 60.5 mph on 185/70R14, and revolutions per mile change from 841 to 834.

Both sizes mount on 14-inch wheels.

Size pages

Other comparisons with 195/65R14

Other comparisons with 185/70R14

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