Tacx Radar Bottle Cage The Tacx Radar is a side-loading bottle cage that holds onto your hydration bottle securely and you can insert and remove your bottle form the right of left side. Plus, it's the ideal bottle cage for smaller bike frames and is engineered from a strong, durable and lightweight glass fibre compound. Features: Material: Glass Fibre Side-Loading Bottle Cage Suited to smaller bike frames Strong and durable designBuy Tacx Accessories from Chain Reaction Cycles, the World's Largest Online Bike Store.