Made from well selected aluminium alloy, this part is lightweight, durable and easy to install on folding bicycles. Rear tensioner converter for folding bikes that converts a multi speed setup to a single speed. Simplifies the drivetrain for low maintenance and predictable performance. Spring adjustable design provides precise chain tension, reducing chain slack and improving reliability during use. Converts multi speed bike to a single speed, suitable for riders who want a simple, streamlined gearing option on a folding bicycle. Compatibility and use - Designed for folding bicycles requiring a rear tensioner for single speed conversion. - Lightweight and compact, it preserves a clean drivetrain with minimal hassle. Use scenarios - Urban commuting on a folding bike with multiple gears, where a simple, dependable single speed is preferred. - Travel or storage trips where a lightweight, low-maintenance drivetrain is advantageous. - Emergency or temporary single speed setup when quick adjustments are needed during rides.