Front Signature convertible front disc hub includes 15mm and 20mm thru-axle adapters Rear Signature convertible disc hub includes 12x135mm and 12x142mm adapters, HG-splined freehub Single speed rear has bolt-on axle (not for horizontal dropouts) All have forged/machined alloy shell and sealed cartridge bearings International-Standard 6-bolt disc rotor mount 6061 aluminum pinned rim