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

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

• Prevents Chain Drop: This 10T folding bike chain guide tensioner securely stabilizes your chain to prevent it from slipping or falling off during rides, especially on bumpy roads or turns. Designed as a direct replacement for Brompton’s original rear derailleur, this bicycle chain tensioner ensures smooth and reliable performance ride after ride.
• Lightweight & Durable Build: Made from high-quality aluminum alloy and POM steel material, this rear derailleur chain tensioner offers excellent wear resistance while keeping weight low at just 320g. The robust construction ensures long-term use without adding unnecessary bulk to your folding bike setup.
• Universal Compatibility: Perfectly fits 3sixty and other internal gear folding bikes, supporting single speed, internal 3/5/8 speeds, and external 2-speed systems. Whether you're commuting in the city or cruising on weekend trails, this bike chain tensioner works seamlessly across multiple bike types including road, mountain, and fixed-gear .
• Premium Material Quality: The combination of aluminum alloy and engineering-grade POM plastic delivers strength, corrosion resistance, and quiet operation. Unlike cheap plastic alternatives, this folding bike chain guide tensioner maintains structural integrity under constant chain tension and varying weather conditions.
• Easy Installation Included: Comes with 1 x bike chain tensioner and 2 x wrenches for quick, tool-assisted setup. No complex adjustments needed—just mount it onto your rear derailleur hanger and enjoy immediate chain stability. Ideal for DIY cyclists who want reliable performance without professional help.