DECATHLON Rockrider Riverside Btwin #500 – Rear Derailleur Gear Mech Hanger


Derailleur mech hanger for Decathlon bikes, fits Rockrider ST 520, ST 540, ST 900, 500S, & more, Riverside 500, 900, 920, E-ST, and various B’TWIN models.

Out of stock

SKU: DH000500 Category:


SILVER COLOUR NOT BLACK AS PICTURE Derailleur hanger replacements are specific to each bike – please check compatibility with our list below, but confirm by comparing your current hanger with the photo, since this is the most reliable way to ensure you are ordering the correct items. Please send a photo to us if you are unsure. All our hangers come with the correct bolts or fittings as appropriate. Why not get another for a spare so you can fix by the roadside next time?

List of compatible DECATHLON bikes:

ST 520, ST 540
ST 900, 8.1 / 8.0 / 9.0 / 9.2 / 9.3 / 9.9
500S, 8.1 / 8.2 / 9.1 / 9.2​

500 / 900 / 920 E-ST 500

various – check picture for exact match

Fitting Instructions
See our fitting guide:

Why do they break?
Derailleur hangers are sacrificial parts designed to break or deform instead of the bike frame. This kind of damage usually happens when a chain gets caught or the derailleur crashes into the spokes. It’s cheaper to replace a hanger than an entire frame, thus reducing / eliminating damage to the frame and drive train components.

Fix My Mech Hanger
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Additional information

Weight 0.05 kg
Dimensions 7 × 4 × 2.5 cm