- Folding bike chain tensioner: lightweight and easy to install, designed for folding bicycles to maintain proper chain tension and reduce derailment. - Folding bike chain stabilizer: compact and lightweight chain guide and pulley wheel guide, easy to install and use, helping to keep the chain aligned and running smoothly. - Single-speed adjuster: compatible with folding bikes that have a derailleur, a practical accessory for radsport enthusiasts, functioning as a chain tensioner for derailleur systems. - Chain stabilizer: lightweight design with an refined appearance, adjustable to achieve optimal chain tension, a reliable chain stabilizer for folding bikes. Use scenarios: - City commuting on a folding bike with a derailleur, to prevent chain slack and ensure smooth shifting. - Weekend rides or training on folding bikes, where quick, on-the-go installation helps maintain chain tension on varied terrain. - Travel or touring with a folding bike, thanks to its compact size and easy setup, keeping the chain securely in place across conditions.