Wheels Manufacturing 20T HG Cassette Spacer Model=Cartridges Horizontal/Vertical mount is determined by

Horizontal/Vertical mount is determined by the bike frame and refers to the battery postion

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Body-mapped impact-absorbing SmartFlex pads offer form-fitting and lightweight protection that is flexible as you ride and hardens on impact

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Wheels Manufacturing 20T HG Cassette Spacer Model=Cartridges Horizontal/Vertical mount is determined byShimano HG Hub compatible single speed conversion kit with ramped spacers. Black anodized. Includes: 2 9mm angled spacers 6 3mm spacers 2 1mm shims 1 lockring 1 20t cogCompatible with: Any x 1 8 pitch chain, this includes BMX and Track chains Any 8 or 9 speed chainDoes not work acceptably with:: Any 10 or 11 speed chain TECH SPECS