Well I bit it on my ST1. Took a very sharp left turn (more than 90 degrees) on very uneven/bumpy pavement and had my left foot/pedal down and it scraped on the ground and the bike spun out under me. I flew over the bike, landing on my belly/arms. I was able to get up! I'M ALIVE! No broken bones or missing teeth, but I probably cant ride for awhile as my leg and wrist hurt and bad road rash on my stomach! I inspected the ST1 and it looks good, but noticed the Sora rear derailleur is bent but it can still shift. Can I just buy another and swap them. Anyone know if I the "GS Medium Cage 9 speed" or the "SS Short Cage 9 speed" is the version I want and if it is literally a swap the new for the old (on amazon http://www.amazon.com/Shimano-Sora-9-speed-Bicycle-Derailleur/dp/B00IAZIFSQ). Thanks.