![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 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](https://preview.redd.it/p6rm2trhtno61.jpg?auto=webp&s=df9a9bd371397dbc3b8e6b5f9b11cd6605e4f5bb)
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
![ALL NEW ROCKRIDER ST 120 VS ROCKRIDER ST 520 || DECATHLON CYCLES 2021 | BEST BTWIN GEAR MTB IN INDIA - YouTube ALL NEW ROCKRIDER ST 120 VS ROCKRIDER ST 520 || DECATHLON CYCLES 2021 | BEST BTWIN GEAR MTB IN INDIA - YouTube](https://i.ytimg.com/vi/9CVqCjBh-_I/maxresdefault.jpg)
ALL NEW ROCKRIDER ST 120 VS ROCKRIDER ST 520 || DECATHLON CYCLES 2021 | BEST BTWIN GEAR MTB IN INDIA - YouTube
![LIKE NEW! Rockrider ST 520 Mountain Bike - Decathlon, Sports Equipment, Bicycles & Parts, Bicycles on Carousell LIKE NEW! Rockrider ST 520 Mountain Bike - Decathlon, Sports Equipment, Bicycles & Parts, Bicycles on Carousell](https://media.karousell.com/media/photos/products/2021/3/10/like_new_rockrider_st_520_moun_1615397396_ba7bfd29_progressive.jpg)