The next generation of bicycle sound generators is here! The Turbospoke bike muffler gives your bicycle the look and sound of a real motorcycle. The engine sounds start as soon as the wheels turn, so the sound changes with the speed of the bike. The sounds are made by a thin plastic Motocard which is held against the spokes of the bicycle wheel. Includes three Motocards for tunable sound, mounting hardware and 15 decals for a custom look. With its variable spacers, the universal clamp will fit to almost any bike frame in minutes. For 16" or larger wheels. Package includes one (1) Turbospoke muffler kit. Buy a second kit for "dual exhaust"! Make your bike look and sound like a real motorbike! 3 Realistic Engine Sounds, with 2-Stage Tuning! The Megaphone Exhaust Pipe really amplifies the sound. Fits any bike 14"+ with the included universal mounting system. Fits in 60 seconds. Mounts to either side of the bike - so you can even fit 2 (with optional second kit). Ages 5+. 100% Pedal Powered, NO Batteries Required.