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with the pedaling with what supports a great deal of pressure. as usual in the fsa firm, their products are characterized by having a finish and exceptional materials, in particular the shaft bottom bracket fsa platinium isis 68 x 113 mm have been manufactured with a hollow forged steel shaft, boasts a central plastic body top, screws cromoly m15 and threaded cups of aluminum. it includes oversized ball bearings, shaft length is 113 mm and is valid for standard width of 68 mm bottom bracket shell boxes the weight is 215 gr and in terms of finish, available in chrome platinum. features: -bottom bracket of the isis type bike. -shaft length: 113 mm -valid for standard width of 68 mm bottom bracket shell boxes -central body of plastic top. -screws cromoly m15. -aluminium threaded cups. -oversized ball bearings. -chrome-plated platinum finish. -weight: 215 gr.