SONIC BOOM 26 (Dirt Jump) DIRT JUMP Classic is back! SONIC BOOM is a high performance dirt jump frame. When you ride into the dirt jump, to enhance supportability from is necessary. It made of Aluminum thats rigid and responsive but lightweight, which built for doing stunts, tricks and go on rampaging. It designed with all the new up to date dirt jump features such as a tapered head tube and super-short chain stay & wheelbase length. Its rear dropouts sit on horizontal sliding system for easy chain tension and also adjust chainstay length. DETAIL GEOMETRY Material: Aluminum Size: 12.8” Tapered Head Tube: IS42/IS52 Seat Post: 30.9mm BB: 73mm W/ISCG05 mount Weight: 2320g Color Available: Matte Black / Matte Violet / Gloss Amber/ Gloss Sky Blue