Essential Chain Tension for Single-Speed Brompton Folding Bikes The Brompton Advance Single Speed Chain Tensioner is designed for 4-speed (actually single-speed internal gear) Brompton folding bikes to maintain proper chain tension and prevent the chain from coming off the sprocket. This handy device helps you avoid interruptions during your journey by keeping your chain tight while still allowing your Brompton to fold smoothly. The chain tensioner attaches to the rear frame where it automatically maintains proper tension without the need for a derailleur system. Suitable for use with MK6 (Advanced) drivetrains and chainring sizes of 50T or 54T, this replacement part is essential when your original tensioner shows signs of wear and tear after lots of use. Made by Brompton to their exacting quality standards, the Advance Single Speed Chain Tensioner ensures your Brompton keeps moving smoothly so you never need to stop and fix a loose chain. Compatible with 10-speed hollow pin chains and Advanced RF (Mk6) drivetrains, this is the genuine Brompton replacement part that maintains the reliability and performance your folding bike is known for. Built to Last Maintains proper chain tension on single-speed Brompton folding bikes to prevent chain slippage. Prevents the chain from coming off the sprocket for uninterrupted riding. Attaches to the rear frame of your Brompton while preserving the bike's ability to fold. Essential for single-speed Bromptons where there is no derailleur to automatically adjust chain tension. Designed specifically for MK6 (Advanced) drivetrain systems. Compatible with 50T and 54T chainring sizes. Works with 10-speed hollow pin chains for optimal performance. Suitable for Advanced RF (Mk6) drivetrain configurations. Genuine Brompton replacement part engineered to factory specifications. Reduces chain wear by maintaining consistent tension throughout your ride. Simple to install on your Brompton's rear frame. Lightweight at just 0.51 lb (approximately 231 grams). Durable construction withstands the demands of daily commuting and folding. Available in black to match most Brompton color schemes. Replacement part for worn tensioners that no longer maintain proper chain tension.
