£50 would get a bike shop to give you a brief look-over in the UK. I don’t know about France, as I can say it’s amazing how much prices can change over short distances.
Two years ago, I cycled 1050 km along the Rhine, and the bike needed work before and after, in addition to me using ~£15 of chain cleaner on the way.
Two years ago, I cycled 1050 km along the Rhine, and the bike needed work before and after, in addition to me using ~£15 of chain cleaner on the way.