derailleur

[Jen]

I have a tiagra rear de.that seems kinda sluggish. Is that how they are? If I upgrade, do you think that an ultegra is noticablly better than a 105 on the rear?

[KnottedYet]

I've been told the higher end derailleurs have stronger springs and shift much faster and smoother. I've never used one, but lots of folks on here have switched up.