Smooth cable routing under the bottom bracket keeps the housing securely in place, reduces friction, and ensures smooth shifting for consistent gear changes and efficient control on any terrain Frame accessory built from quality material to withstand outdoor conditions and daily cycling use, providing reliable cable support with long lasting strength for both mountain and road bikes Easy installation with screws included; attaches to the bike frame quickly without special tools, enabling repairs or upgrades at home or outdoors Enhanced cycling performance by preventing cable drag and friction; maintains gear accuracy and braking response, improving overall efficiency for commuting, racing, training, or leisure on trails and roads Durable design suitable for mountain and road bikes; a practical bottom bracket housing guide that delivers reliable support and long term functionality Use scenarios: commuting and urban riding for reliable shifts; trail and mountain biking on rough terrain for consistent cable routing; road riding or training where tool , at home upgrades are convenient Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.