175/65R14 vs 175/70R14

175/70R14 is 0.69 in (17.5 mm) taller than 175/65R14, a +3.00% diameter difference. With the speedometer set for 175/65R14, an indicated 60 mph is 61.8 mph on 175/70R14.

Is this a safe swap?

Diameter difference +3.00%: outside the ±3% guideline

By overall diameter alone, 175/70R14 falls outside the ±3% range commonly used as a guideline when replacing 175/65R14; speedometer and ride-height changes are larger. 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.

175/65R14 vs 175/70R14 differences
Measurement	175/65R14	175/70R14	Difference	% diff
Overall diameter	22.96 in (583.1 mm)	23.65 in (600.6 mm)	+0.69 in (+17.5 mm)	+3.00%
Sidewall height	4.48 in (113.8 mm)	4.82 in (122.5 mm)	+0.34 in (+8.8 mm)	+7.69%
Section width	6.89 in (175.0 mm)	6.89 in (175.0 mm)	0.00 in (0.0 mm)	0.00%
Circumference	72.12 in (1,831.9 mm)	74.29 in (1,886.8 mm)	+2.16 in (+55.0 mm)	+3.00%
Revolutions per mile	879	853	−26	−2.91%

True speed with the speedometer calibrated for 175/65R14
Indicated	Actual on 175/65R14	Actual on 175/70R14	Difference
30 mph	30.0 mph	30.9 mph	+0.9 mph
60 mph	60.0 mph	61.8 mph	+1.8 mph
75 mph	75.0 mph	77.3 mph	+2.3 mph

Ride-height change: 175/70R14 raises the vehicle by 0.34 in (8.8 mm) at the axle (half the +17.5 mm diameter difference).

175/70R14 is 0.69 in taller than 175/65R14 and the same width, a 3.00% difference in overall diameter.

With the speedometer calibrated for 175/65R14, an indicated 60 mph is actually 61.8 mph on 175/70R14, and revolutions per mile change from 879 to 853.

Both sizes mount on 14-inch wheels.

Size pages

Other comparisons with 175/65R14

Other comparisons with 175/70R14

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