Brompton C line 2/6 Speed Rear Chain Tensioner Chain Pusher Assembly Free Ship

This Brompton C line chain tensioner and pusher assembly kit is a practical buy if you're looking to service or rebuild the rear derailleur system on a 6-speed folding bike. The kit brings together four separate components that work together to keep the chain properly tensioned and positioned as it moves across the sprockets, which is essential for smooth gear changes and reliable shifting on a compact folding bicycle like the Brompton.

The main piece here is the chain tensioner assembly (part number QCTADR), which is a used component rated at £33 of the original retail value. This works alongside three new spare parts: a derailleur cable anchorage and spring set for the integrated shifter, a chain pusher assembly (QCHPUA), and an additional spare cable anchorage and spring. Together, these parts handle the mechanical work of keeping tension on the chain and managing how the derailleur cage moves, which is what lets you shift cleanly between the six speeds.

The assembly is designed for Brompton's C line and A line models fitted with derailleurs, so compatibility depends on your specific bike's configuration. The 16-inch wheel size on these Brompton frames means the geometry is tight, and having a properly functioning chain tensioner becomes even more important in that compact setup. If you're replacing worn tensioner components or doing a full derailleur refresh, this bundle covers the main wear points in one package, and UK postage is included with the sale.