Hi there /DISCLAIMER: I'm new to cycling and know very little... Was hoping someone can help me, I did a race this weekend and close to the end my MTB started make a grinding sound, which I eventually identified as coming from the chain wheel. There is a bolt/screw protruding from the frame and it is making contact with the chain when on the small chain ring. The screw has clearly taken some damage from the contact. Here are 2 photos that will hopefully help - What am I looking at? What is wrong? How do I fix it? Thanks!
