Definitions of SAE Classifications

SAE CLASS “S”

Regular (non-reinforced) passenger tire chains and cables for vehicles with restricted wheel well clearances.

1.46″ clearance on tread-face, 0.59″ clearance on side-wall

SAE CLASS “U”

Regular (non-reinforced) and lug reinforced passenger tire chains for vehicles with regular (non-restricted) wheel well clearances.

1.97″ clearance on tread-face, 0.91″ clearance on side-wall

SAE CLASS “W”

Those passenger tire chains that use light truck components, as well as some light truck chains.

2.50″ clearance on tread face, 1.50″ clearance on side-wall