The Firefox Cyclone is built on a Kids specific Alloy frame which is light and durable. The frame offers good stability. Alloy Hardtail MTB Frame with front Zoom Suspension, Shimano Tourney RD & FD & Shimano EZFire Shifter The bike is equiped with V-Brake for Power Braking, Double wall rims for extra strength, Seat QR for easy saddle adjustment