The XLC DO-A17 derailleur hanger is a high-quality replacement derailleur hanger from XLC's vast range of bicycle components. It is constructed from lightweight aluminium, so it will only add mere grams to the overall weight of your bike – something that is hugely important for many riders. The hanger is more vital than many people realise, as it keeps your derailleur straight and secure; in turn, it helps maintain smooth shifting. If your bike takes a knock or the hanger becomes bent, it needs to be replaced to keep your drivetrain running smooth. The XLC derailleur hanger DO-A17 is suitable for most types of bikes and comes with two holes, one to fasten to the frame and a second to secure the derailleur.