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The Mission American Bottom Bracket Hop Up Kit includes everything you need to upgrade your unsealed 8-spline cranks to fully sealed. This kit includes 2 sealed cartridge style bearings in American adapter cups, drive side and non-drive side dust caps and spacers, an internal spacer, a hat washer for your sprocket, and a 19mm, 8 tooth spindle and 2 spindle bolts. Step up your bottom bracket game with the Mission American Bottom Bracket Hop Up Kit.