€69.99 My friend has a Btwin rockrider 520 (image attached) needing to replace the bottom bracket trying to figure out what type it is : r/bikewrench
Btwin Rockrider 520 Mtb Bike Good Stock Photo 2099483074 | Shutterstock
Rock Rider 520 Outlet Shop, UP TO 54% OFF | www.rupit.com
![btwin rockrider 520](https://i5.walmartimages.com/asr/cd9db6a3-be55-44cc-aff7-7d3b216b289d_1.66e659822cfa6a5c5da4d047d5e8e59e.jpeg "Decathlon Rockrider ST520, 21 Speed Mountain Bike, 27.5\")