I've been having some shifting problems on my bike. My mechanic thinks its a bent RD hanger. It's been bent several times before and he's bent it back for me but I think metal fatigue has set in. I got a new hanger today and removed the derailleur to install it. (The new hanger ended up not the being the right part, so I had to place another order ).
I noticed that while the tension pulley spins without much resistance, the guide pulley has a lot of resistance. Is that normal? Is there something wrong with my derailleur? At the very least, it can't be very efficient.
The bike is a 2007 Scattante Comp CFR with only about 1,600 miles on it. The drivetrain consists of 105 shifters, a (recently upgraded) R700 compact crankset, and an Ultegra rear derailleur.