Quote from aikigreg on Apr 19th, 2007, 1:11pm:Garrie brought up an interesting point. He says the rear der. may not have enough oomph to take up the slack in the big ring/small cog combo. Guess I might have to do an 11-32 after all, and perhaps change out the smallest front chainring to a 26 or a 28, if the derailleur can handle that much drop from a 39 middle.
Yeah, that's a consideration. Do you have a triple crank? Most bikes with triple cranks have the long derailler arm which will handle an 11-34 fine. Look at double crank road bikes and you'll see a really short rear derailler arm which won't handle as much slack.
Lots of riders still call the short arm deraillers road derailler and the long arm deraillers mtb deraillers, but that really isn't valid any more with so many triples on road bikes.