27.5/29er bike frame:titanium alloy mountain bike Frame XC bicycle cyclocross frame 15.5''/17''/19'', high strength,commonly used high-end bicycles for competition and leisure.
Advantages:Light weight,increases speed,reduces physical exertion during long-distance exercise,have good rigidity shock absorption.
Specifications:For tapered headset 42*52mm,BSA(68mm) threaded bottom bracket,seat post 31.6mm,seat clamp 34.9mm,thru axle 12x142mm,max for 2.1'' tires.