Downhill is an expensive sport, bikes, equipment, lift tickets, maintenance. With the development of the Boner chain tensioner, the goal was to offer a strong, reliable and affordable option to those looking to upgrade to a single speed setup to avoid destroying expensive derailleurs. Designed starting with the G3 with high quality CNC machined 7075 T6 alloy body and cage, this chain tensioner offers infinite side and rotational chain alignment, you won't need multiple spacers to set the correct chain alignment. This chain tensioner can be used on a wide range of frames and gear sizes. It also features a simple cage lock for easy wheel removal.

- Very high cage tension
- Cage lock for easy assembly and disassembly of the rear wheel
- Adjustable alignment (18 mm adjustment range)
- Encapsulated locking system, the torsion spring is protected from dust and dirt
- Mounting on the derailleur hanger
- For hubs with Shimano HG 9/10/11 speed freehub body
- Material: CNC machined AW-7075 T6 aluminum alloy
- Weight: 170 g