Reliable chain tensioning solution This bicycle chain adjuster tensioner is made from sturdy aluminum alloy, providing a dependable mechanism for maintaining proper chain tension on singlespeed bikes. Featherweight design Weighing only 3 g, this tensioner minimizes added weight while supporting consistent performance during rides. Singlespeed optimized performance Tailored specifically for singlespeed bicycles, it helps ensure smooth operation and improved drivetrain efficiency. Key specifications Material: aluminum alloy Weight: 3 g Compatibility: singlespeed bicycles Function: chain tensioner Use scenarios Daily city rides on a singlespeed bike: helps keep the chain tension correct over uneven roads and load changes. After chain replacement or adjustment: enables quick retensioning to restore smooth operation. Light touring or commuting where weight matters: provides reliable tension with minimal added weight.