2011 Toyota Sequoia Owners Manual - Page 1150

6-1. Specifications Radial tires or bias-ply tires A radial tire has RADIAL on the sidewall. A tire not marked RADIAL is a bias-ply tire. Summer tire or all season tire (→P. 532) An all season tire has M+S on the sidewall. A tire not marked M+S is a summer tire. Typical DOT and tire identification number (TIN) DOT symbol* Tire Identification (TIN) Number Tire manufacturer's identification mark Tire size code Manufacturer's optional tire type code (3 or 4 letters) Manufacturing week Manufacturing year *:The DOT symbol certifies that the tire conforms to applicable Federal Motor Vehicle Safety Standards. 640