Designed by ZIPPIN, the Micro SpeederBike. Made to fit an AlienWii Narrow, 8.5mm motors, and a mini figure,its a fast and smooth, but challenging ride.The SpeederBike does not only resemble a bike in shape, but also in character.Once you get up to speed and leave the gas open, its a very locked-in, solid flight. When you slow down, she's getting a little tipsy on the roll. This frame has gone through many wild iterations, especially on the arm design. We finally settled on crossed arms with a cross brace and straight mounts, symmetric on front and rear.The low center of gravity and the narrow stance create a unique flight experience. specifications: - motor mounts: 8.5mm- 130x52mm outer dimensions- 120x40mm motor distance- material: laser-sintered nylon- weight: 6g maximum prop size: 66mm. We recommend the following parts on this frame:propeller: Parrot 66mmmotor: CL-0820-15 (you need 4 motors in the same direction!)battery: mylipo 480mAhflight controller: AlienFC