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![btwin rockrider 520 s](https://i.ytimg.com/vi/R1Lj-IaGhRw/maxresdefault.jpg "ROCKRIDER 520 S - 27,5\")
![btwin rockrider 520 s](https://www.bikebargains.co.uk/wp-content/uploads/2021/06/B-Twin-Rockrider-27.5-ST-520S-Alloy-Full-Suspension-MTB-Frame-Alloy-Frame-27.5-Disc-Full-Suspension-Black-Red.jpg "B'Twin Rockrider 27.5\")