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Cannondale Adapter Headset - 1 1/2" straight frame to 1 1/8" straight fork
Have a bike with a 49mm (1 1/2") steer tube, and looking to put on a 1 1/8" fork, then this is what you need. V2 has been upgraded to have 41mm cartridge bearings.
Does not work on Headshoks, Leftys, or tapered forks. This only fits on 1.5" head tubes.
Kit includes headset cups, bearings, crown race, lower bearing seal, upper bearing wedge, top plate, five 5mm 1 1/8" headset spacers, star nut, top cap, and top cap bolt.
Zero Stack upper cup insertion depth is ~22mm, external cup lower cup insertion depth ~10mm, lower cup stack height ~12mm.