Become a model citizen. The Haro Citizen frame was designed with our innovative PTC (Power Transfer Center) bottom bracket, which maximizes down tube and chain stay width to create the stiffest, most responsive frame on the track. A tapered head tube stiffens up the front end of the bike for improved steering response, accommodating a larger fork crown for more strength. CNC-machined alloy rear dropouts are compatible with 10mm, 15mm and 20mm rear axles with the included hardware and adapters. The Citizen frame is disc brake compatible with adapter (sold separately). Set 'em riders.