Turbospoke Not only makes a bicycle look like a real motorbike, but it also converts plain old pedal power into realistic engine Noises. Using durable plastic Motocards and a realistic megaphone exhaust pipe, the Bicycle Exhaust System totally revolutionises the "card in the spokes" concept. The Bicycle Exhaust System can Now be fitted to either side of the bike, making a greater range of sounds, cooler and stronger big bore exhaust pipe and fits to 100% of bikes (from 14”-24”)! It’s waterproof and doesn’t require any batteries. It comes with a full fitting kit and 24 awesome stickers to decorate your exhaust pipe.