315/35R22 tire size

A 315/35R22 tire is 30.68 inches (779.3 mm) tall, 12.40 in (315 mm) wide and fits a 22-inch wheel. In inch notation it is roughly a 30.7x12.4R22 — a "31-inch" tire.

315/35R22 dimensions
Overall diameter	30.68 in	779.3 mm
Section width	12.40 in	315 mm
Sidewall height	4.34 in	110.3 mm
Circumference	96.39 in	2,448 mm
Revolutions	657.3 per mile	408.5 per km
Rim diameter	22 in	558.8 mm

Compare 315/35R22 with another size

Current size

New size

Speed in mphkm/h

Overall diameter difference

+0.90%

60 mph on the speedometer = 60.5 mph actual

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

Ground clearance: +3.5 mm (+0.14 in)
Revolutions: 657 → 651 per mile

315/35R22 325/35R22

Side-by-side dimensions

	Current	New	Difference	%
Diameter	30.68 in	30.96 in	+0.28 in	+0.90%
Diameter	779.3 mm	786.3 mm	+7.0 mm	+0.90%
Width	12.40 in	12.80 in	+0.39 in	+3.17%
Width	315.0 mm	325.0 mm	+10.0 mm	+3.17%
Sidewall	4.34 in	4.48 in	+0.14 in	+3.17%
Sidewall	110.3 mm	113.8 mm	+3.5 mm	+3.17%
Circumference	96.39 in	97.25 in	+0.87 in	+0.90%
Revs per mile	657.3	651.5	−5.9	−0.89%

Speedometer error

Speedometer shows	Actual speed	Difference
20 mph	20.2 mph	+0.2 mph
30 mph	30.3 mph	+0.3 mph
40 mph	40.4 mph	+0.4 mph
50 mph	50.4 mph	+0.4 mph
60 mph	60.5 mph	+0.5 mph
70 mph	70.6 mph	+0.6 mph
80 mph	80.7 mph	+0.7 mph

Alternative sizes on the same 22-inch wheel

Sizes in use within ±3 % of the overall diameter of 315/35R22:

Plus and minus sizes for 315/35R22

Size	Wheel	Diameter	Difference
295/45R20	Minus 2 (20 in)	30.45 in	−0.74%
285/50R20	Minus 2 (20 in)	31.22 in	+1.76%
285/45R20	Minus 2 (20 in)	30.10 in	−1.90%
305/40R21	Minus 1 (21 in)	30.61 in	−0.24%
315/40R21	Minus 1 (21 in)	30.92 in	+0.78%
295/40R21	Minus 1 (21 in)	30.29 in	−1.27%
285/45R21	Minus 1 (21 in)	31.10 in	+1.36%
325/30R23	Plus 1 (23 in)	30.68 in	−0.01%
285/35R23	Plus 1 (23 in)	30.85 in	+0.56%
315/30R23	Plus 1 (23 in)	30.44 in	−0.78%
295/35R23	Plus 1 (23 in)	31.13 in	+1.46%

Vehicles approved with 315/35R22 tires

Models whose Swiss type approval lists 315/35R22 as a standard or optional size (301 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 22-inch sizes

Reading the 315/35R22 size

315 — section width in millimetres (12.40 in).
35 — aspect ratio: the sidewall is 35 % of the width, 110.3 mm.
R — radial construction (ZR on the sidewall means a high-speed rated radial; the dimensions are the same).
22 — fits a 22-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.