Well i think I have decided to upgrade to Sram x-0. I need a new front derailer, and I am not putting another crap derailer on like now(shimanoe deore). So I figure I will upgrade, and if I do one part, I HAVE to do the rest. That with the fact that performance has a 20% off sale today, I think I am going with all X-0.
So my question, what is the difference between a long cage, and medium cage rear derailer?