155/70R13 tire size

A 155/70R13 tire is 21.54 inches (547.2 mm) tall, 6.10 in (155 mm) wide and fits a 13-inch wheel. In inch notation it is roughly a 21.5x6.1R13.

155/70R13 dimensions
Overall diameter	21.54 in	547.2 mm
Section width	6.10 in	155 mm
Sidewall height	4.27 in	108.5 mm
Circumference	67.68 in	1,719 mm
Revolutions	936.2 per mile	581.7 per km
Rim diameter	13 in	330.2 mm

Compare 155/70R13 with another size

Current size

New size

Speed in mphkm/h

Overall diameter difference

−0.46%

60 mph on the speedometer = 59.7 mph actual

Within the ±3 % diameter range most tire fitters accept.

Ground clearance: −1.3 mm (−0.05 in)
Revolutions: 936 → 940 per mile

155/70R13 165/65R13

Side-by-side dimensions

	Current	New	Difference	%
Diameter	21.54 in	21.44 in	−0.10 in	−0.46%
Diameter	547.2 mm	544.7 mm	−2.5 mm	−0.46%
Width	6.10 in	6.50 in	+0.39 in	+6.45%
Width	155.0 mm	165.0 mm	+10.0 mm	+6.45%
Sidewall	4.27 in	4.22 in	−0.05 in	−1.15%
Sidewall	108.5 mm	107.3 mm	−1.3 mm	−1.15%
Circumference	67.68 in	67.37 in	−0.31 in	−0.46%
Revs per mile	936.2	940.5	+4.3	+0.46%

Speedometer error

Speedometer shows	Actual speed	Difference
20 mph	19.9 mph	−0.1 mph
30 mph	29.9 mph	−0.1 mph
40 mph	39.8 mph	−0.2 mph
50 mph	49.8 mph	−0.2 mph
60 mph	59.7 mph	−0.3 mph
70 mph	69.7 mph	−0.3 mph
80 mph	79.6 mph	−0.4 mph

Alternative sizes on the same 13-inch wheel

Sizes in use within ±3 % of the overall diameter of 155/70R13:

Plus and minus sizes for 155/70R13

Size	Wheel	Diameter	Difference
165/60R14	Plus 1 (14 in)	21.80 in	+1.17%
155/65R14	Plus 1 (14 in)	21.93 in	+1.81%
165/55R14	Plus 1 (14 in)	21.15 in	−1.85%
185/55R14	Plus 1 (14 in)	22.01 in	+2.17%
175/50R15	Plus 2 (15 in)	21.89 in	+1.61%
195/45R15	Plus 2 (15 in)	21.91 in	+1.70%

Vehicles approved with 155/70R13 tires

Models whose Swiss type approval lists 155/70R13 as a standard or optional size (192 approvals in total). Always check your own vehicle's placard or papers.

Source: Swiss Federal Roads Office (FEDRO/ASTRA), open government data. Original data (downloaded 2026-09-29). Data processed by us; errors in processing are ours, not the publisher's.

Nearby 13-inch sizes

Reading the 155/70R13 size

155 — section width in millimetres (6.10 in).
70 — aspect ratio: the sidewall is 70 % of the width, 108.5 mm.
R — radial construction (ZR on the sidewall means a high-speed rated radial; the dimensions are the same).
13 — fits a 13-inch diameter wheel.

The load index and speed rating (for example 91V) follow the size on the sidewall. They must meet at least the values on your vehicle's tire placard.