Fast, tool-free setup Install the chain tensioner quickly without complicated tools. Simple adjustments let you set chain tension for a smooth, immediate ride. Prevents chain drops and protects the frame Keeps the chain from falling off or tangling and provides scratch-resistant protection for your frame during use and adjustments. Adjustable and versatile 17 mm adjustment range fits a wide variety of frames. Designed for single-speed bicycle systems and compatible with mountain bikes and many folding bikes. Lightweight, durable design with color Single-bolt, lightweight construction and an anodized finish add a clean, colorful look while resisting oxidation for long-term durability. Split-style mounting improves fit and serviceability. Key specifications Function: Chain tensioner for single-speed systems Adjustment range: 17 mm Compatibility: Single-speed bikes; suitable for mountain bikes and some folding bikes Design features: Single-bolt, split mounting, anodized finish; protects frame from scratches Typical use cases Daily commuter: Keep a single-speed commuter bike chain reliably tensioned for smoother, safer rides and fewer roadside adjustments. Trail or off-road rides: Use on mountain bikes converted to single-speed to prevent chain drops while riding over rough terrain. Folding bike conversions or compact storage: Fine-tune chain tension after wheel or drivetrain changes on folding bikes to maintain consistent performance. Why customers choose this part Quick, no-fuss installation and adjustment Reduces maintenance and roadside repairs by preventing chain issues Adds a durable, low-corrosion finish and a neat, compact mounting solution compatible with a range of frames What’s included / recommended Chain tensioner unit (single-bolt, split-mount style) Recommended for use with single-speed drivetrains; check frame clearance and dropout type for compatibility before installation If you need a reliable, easy-to-install tensioner to stop chain drops, protect your frame, and keep single-speed bikes running smoothly, this adjustable unit provides a practical, low-maintenance solution.