TOYOTA 2011 Prius - Manual (Page 298)

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2-5. Driving information
PRIUS_U (OM47685U) DVD
Selecting tire chains
Vehicles with 17-inch tires
Use the correct tire chain size when mounting the tire chains.
Chain size is regulated for each tire size.
Side chain:
0.12 in. (3.0 mm)
1.18 in. (30.0 mm)
0.39 in. (10.0 mm)
Cross chain:
0.16 in. (4.0 mm)
0.98 in. (25.0 mm)
0.55 in. (14.0 mm)
Vehicles with 15-inch tires
Use the tire chains of correct size and type.
Use SAE Class “S” type radial tire chains except radial cable chains or V-
bar type chains.