Bluebird frame uses the same simple but very effective suspension system as the Blackbird but delivers 130mm travel optimized for longer days on the trails. New top tube with bent shape for nice look and low standover. The rear axle spacing is 148x12mm Boost standard and is designed for 27.5" wheels with tire size from 2.3" to 2.8". The advanced swingarm cage equipped with three Max type sealed bearings and strong 17mm diameter axle ensures a stiff and strong frame. The higher placed pivot position offers high pedaling efficiency and eliminates pedal-bob when climbing. The low BB position provides high stability in difficult terrain while the 66˚ head tube angle ensures a perfect riding control no matter how steep is the track. A construction using shock extension yoke makes it possible to keep a full length seat tube allowing room for the new breed of dropper seat posts.