Discover new adventures. Discover freedom. An amazingly powerful, versatile gravel racing bike. Built to explore horizons, discover less-traveled routes, or speed up your commute. Model description Pure gravel capability. With the smooth SmartForm C2 Alloy frame, precise shifting from Shimano's GRX 2x12-speed gravel components, robust WTB rims and tires, and a wealth of mounts, the Topstone 1 sets the standard for high-performance versatility. Load up and go. What it's made for Gravel riding, exploration, bikepacking, performance commuting Highlights Lightweight SmartForm C2 aluminum frame with full carbon fork Exceptionally precise and refined shifting from Shimano's top-tier mechanical GRX 820/600 2x12-speed gravel group Outstanding performance and modulation from Shimano's GRX 600/400 hydraulic disc brakes Robust, reliable WTB ST i23 TCS tubeless rims with Riddler tires 700x37c Long-distance comfort with the Fizik Aliante Delta saddle