Hello all New to the forum and have a question... I had a minor accident with my xc100 and utterly destroyed the rear derailleur. Stupidly, I did not save the mangled mess, so here goes... does anyone know the actual 7 speed shimano rear derailleur for the eahora xc100? I was told by my local shop it was the Altus M310. Eahora's product specs say the same. However the product shot (although very unclear) looks like it reads 'Tourney' . I bought the M310 on the shops advice, and I will tell you, it does not fit nor work! Guess i should have researched just a little bit more before buying! So, I'm assuming it should be a 'Tourney', but which one??? Sorry to sound like an amateur, I should have handled my situation more cautiously and intelligently. I miss my bike. Can somebody help? The rest of the bike is still stock; no upgrades. Thanks everybody. Glad to find you all.