10T Folding Bike Chain Guide Tensioner, Bicycle Rear Derailleur Chain Tensioner, Aluminum Alloy Chain Keeper for 3sixty and Brompton Folding Bikes with Internal Gear

Item Type: Bike Chain TensionerMaterial: Aluminum alloy+POMNumber of Teeth: 10TFitment: Fit for 3sixty and other internal variable speed folding bike (single speed, internal 3 speeds, external 2 speeds, internal 5 speeds and internal 8 speeds)Application: For Brompton special rear derailleur can replace for Brompton original rear derailleur as a whole, and help the chain to prevent the chain from falling off more effectivelyWeight: Approx. 320g / 11.3ozPackage List：1 x Bike Chain Tensioner2 x Wrench

• Chain Security: This 10T folding bike chain guide tensioner keeps your chain firmly in place during rides, preventing slippage or derailment—especially critical on bumpy roads or when shifting gears on internal hub systems like 3sixty or Brompton bikes.
• Lightweight Durability: Constructed from high-quality aluminum alloy and POM steel, this bicycle chain tensioner offers excellent wear resistance while adding minimal weight (only 320g), ensuring long-term reliability without burdening your folding bike’s performance.
• Universal Compatibility: Designed specifically for 3sixty and Brompton folding bikes, this rear derailleur chain tensioner works seamlessly with single-speed, internal 3/5/8-speed, and external 2-speed setups, making it ideal for urban commuters and touring cyclists alike.
• Premium Materials: The bike chain tensioner combines corrosion-resistant aluminum alloy with high-strength POM plastic to deliver smooth chain guidance and quiet operation, even under heavy use or in wet conditions.
• Easy Installation: Includes two wrenches for quick setup—no special tools needed. This folding bike chain guide tensioner replaces the original Brompton rear derailleur as a complete unit, offering a hassle-free upgrade that enhances ride safety and drivetrain efficiency.