Im looking into buying a new F/D and R/D. I know little about derailleurs. To my knowledge there are 2 types of R/D long cage and short cage i believe they're called. And for F/D there are 3 types? i forget the names. How would i know which type of derailler I would want?
BIKE: TREK 4900 '02
FRONT DERAILLEUR: Shimano Alivio
REAR DERAILLEUR: Shimano Deore SGS