GANOPPERAlloy Rear Derailleur Hanger Tail Hook With Bolts

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The Rear Derailleur Hanger - No 10 fits my Trek 4300 perfectly, replacing one that had been bent quite badly causing bad shifting. If you look at the hanger on your bike or google the model and year it is likely that you will find one of these to fit - they are standard designs but do differ between ages and models. The quality is great and shifting is now back to normal, plus I now have a spare it it happens again!

Derailleur hangers are quite vulnerable to bending if you knock the gears on something, so it's useful to have some spares. In my case, the no 12 is the right part (it's confusing that manufacturers use so many different designs). The package I received has two no. 12's (black in colour) with matching bolts.