precision threaded machining provides a tight, secure connection to the bike wheel and smooth operation during riding. Made from aluminum alloy, this flywheel offers strong performance while being rust resistant and wear resistant for durable use. Folding bike single speed flywheel is designed to deliver fast cycling speed while reducing pedaling effort, improving efficiency on compact, portable setups. Mountain bike single speed flywheel delivers smooth turn action with low noise for reliable, quiet operation on rugged terrain. Use scenarios Urban folding bike commuting: install this flywheel on a folding bike to achieve quicker acceleration and steadier cadence, making daily trips smoother and more efficient. Weekend mountain rides: pair the single speed flywheel with a mountain bike for a predictable, smooth pedaling feel and quieter operation on trails. Maintenance and upgrade: an aging or worn flywheel to restore performance, reduce friction, and extend the life of your driveline on both folding and mountain bike configurations.