Projekt Fixie - Cycle Fixed Gear Road Singlespeed Bike Track Frameset Frame Fork Use with Projekt Fixie 68mm x 103mm JIS Square Tapered BB Ultra-strong Hiten Steel, Tig-welding craftsmanship 1-1/8" inch Threadless Steerer Tube/Fork Compatible with 25.4mm Seatpost / 28.6 Seatpost Clamps Assemble with other Projekt Fixie Components for compatibility