- Carbon fibre chain catcher: made from carbon fibre, this component is hard and wear-resistant, providing practical and durable long-term bicycle use as a reliable accessory. - Chain tensioner and aluminium chain guard: with this chain tensioner, multi-speed bicycles can be converted into single-speed bicycles, with an aluminium chain guard to enhance protection and rigidity. - Lightweight chain protector: this bicycle chain protector is lightweight and compact, easy to install and use as a protective tool for the chain. - Dual purpose chain protection tool: practical and decorative, it can serve at the same time as a bicycle decoration and a chain guard. - Use scenario 1: convert a multi-speed road or commuting bike to a single-speed setup for simple maintenance, reduced gearing complexity, and a cleaner drivetrain on track or urban rides. - Use scenario 2: install for everyday riding to protect the chain from debris, improve chain alignment, and add lightweight protection without adding significant weight. - Use scenario 3: use as a subtle decorative accessory on show bikes or customized builds while providing practical chain guarding and protection.