I saw this Rockrider 7.6 for sale at 200€. It's 20 years old but I got no clue how much it has been ridden; what should be serviced after all these years,
Decathlon Rockrider XC mountain bikes on the UCI World Cup - Bikerumor
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Mountain bike Btwin Rockrider 540 2017 - VENDRE-SON-VELO.COM