| Thun Bottom Bracket ´´Efficient Zumb´´ square (12,73mm), BSA thread (1,375 x 24 / 68mm housing width), Gates CDN belt drive compatible,Durable, maintenance-free, weatherproof. Left side with functional shoulder (FS), special hardened axle material (ML treatment), ISO 4210-8:2014 (MTB). Optimum rotation quality over double sealed industrial bearings, zinc-coated steel sleeve (Ø 27mm) to protect the bottom bracket and especially suitable for cable passage.Thread adapter made of composite A, including 2 inside hexagon screws with polyamide-stain cover and clips-ring, made in Germany Assembly advice: adapter tightening torque: 25-30Nm (assembly without grease), screw tightening torque: 45Nm, GBL … | |