Hello, I ride on the 2014 Haibike FS RS. I bought it new and have done about 200 miles off-road and about 500 overall on the bike. Yesterday I came back from a ride in a mtb centre and when packing the bike into the car, the cassette and the rear derailleur came off. The freehub is still attached to the cassette and after closer inspection the thread inside the bit that attaches derailleur to the frame has sheared off. As the bike was build on standard mtb parts, shall I replace them with the same or go for the dedicated ones? So far i only found the sram ex1 so would it work with the shimano shifter? Also, shall I invest in the new rear hub or try to repair the broken one? I can post some pictures if needed. On the side note, i understand that things brake, but the bike was not cheap and was well spec so what is to blame? Maintenance, not dedicated emtb parts, my 95kg weight, type of ride? Thanks in advance.