Durable construction and reliable performance Material and durability: Made of aluminum alloys and steel, providing strong, rust resistant and wear resistant construction. Smooth and quiet operation: Folding bike single speed flywheel delivers smooth turning action with minimal noise. Precise fit and running: accuracy threading ensures a tight connection with the bike wheel for silky, stable running. Easy replacement: Directly replaces old parts and accessories, maintaining normal operation of your bike. Key features Function: Replacement flywheel for folding bikes with single speed setups; restores smooth pedal action and reliability. Compatibility: Designed to directly old parts and accessories on compatible folding bikes. Material: Aluminum alloys and steel for strength and durability. Performance: Smooth rotation, low noise, and secure installation due to precision threaded machining. Applications and use scenarios Daily commuting: a worn flywheel to restore smooth, quiet pedaling and reliable performance on urban commutes. Bike refurbishment: Use as part of a refurb or upgrade to improve running quality and reduce play or noise. Spare part stock: Suitable as a ready replacement component for bike shops or cycling clubs to maintain fleet readiness.