Width of castor bearing surface [mm]: 26; Housing material: Aluminium; Track rollers material: Plastic; Outer Diameter [mm]: 64; Operating Mode: Automatic; Weight [kg]: 0,57; Observe service information: ; TecDoc Engine Number: 27472; Driven Units: Alternator, Water Pump; BMW: 3 Touring (E91),3 Limousine (E90),1 Schrägheck (E87),3 Coupe (E92),3 Cabrio (E93); 11287790447; Belt Tensioner,Belt Tensioner, v-ribbed belt