Radio Zuma Bike - 20", Aluminum, Black Super Lightweight Alloy Frame And ForkWith a full range of sizes for the first time rider, all the way through to a 26 wheeled machine for the aspiring rookie, there is a ZUMA for every rider. These carefully spec'd bikes feature a super lightweight alloy frame and fork with double wall rims and children specific aftermarket components from Promax, KMC, FSA, Vee Rubber and Satori, making them suit the rider size perfectly, but look, feel and ride just like a high end full adult size MTB.