Chain tensioners make sure the chain stays tight when riding, and depending on the type of tensioner, can also adjust the position of the wheel on the frame.

Key points:

· Type: there are snail cams (they sit on the hub axle and push the wheel backwards), integrated tensioners (Echo’s integrated bolt) and sprung tensioners (growing in popularity for frames with vertical dropouts).

· Compatibility: each frame is designed for a specific type of chain tensioner, so be sure to choose the appropriate tensioner for your frame.