155/80R13 vs 165/70R14

165/70R14 is 0.33 in (8.4 mm) taller than 155/80R13, a +1.45% diameter difference. With the speedometer set for 155/80R13, an indicated 60 mph is 60.9 mph on 165/70R14.

Is this a safe swap?

Diameter difference +1.45%: within the ±3% guideline

By overall diameter alone, 165/70R14 falls inside the ±3% range commonly used as a guideline when replacing 155/80R13. 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.

155/80R13 vs 165/70R14 differences
Measurement	155/80R13	165/70R14	Difference	% diff
Overall diameter	22.76 in (578.2 mm)	23.09 in (586.6 mm)	+0.33 in (+8.4 mm)	+1.45%
Sidewall height	4.88 in (124.0 mm)	4.55 in (115.5 mm)	−0.33 in (−8.5 mm)	−6.85%
Section width	6.10 in (155.0 mm)	6.50 in (165.0 mm)	+0.39 in (+10.0 mm)	+6.45%
Circumference	71.51 in (1,816.5 mm)	72.55 in (1,842.9 mm)	+1.04 in (+26.4 mm)	+1.45%
Revolutions per mile	886	873	−13	−1.43%

True speed with the speedometer calibrated for 155/80R13
Indicated	Actual on 155/80R13	Actual on 165/70R14	Difference
30 mph	30.0 mph	30.4 mph	+0.4 mph
60 mph	60.0 mph	60.9 mph	+0.9 mph
75 mph	75.0 mph	76.1 mph	+1.1 mph

Ride-height change: 165/70R14 raises the vehicle by 0.17 in (4.2 mm) at the axle (half the +8.4 mm diameter difference).

165/70R14 is 0.33 in taller than 155/80R13 and 10 mm wider, a 1.45% difference in overall diameter.

With the speedometer calibrated for 155/80R13, an indicated 60 mph is actually 60.9 mph on 165/70R14, and revolutions per mile change from 886 to 873.

165/70R14 mounts on a 14-inch wheel, a plus-1 fitment from the 13-inch wheel of 155/80R13.

Size pages

Other comparisons with 155/80R13

Other comparisons with 165/70R14

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