Originally Posted by dzinehaus
thanks I found the tech specs for the shimano 105 shortcage read derailleur. Says 22t max front difference for the long, so i'm guessing about the same for the short maybe about 2 less. Which kinda sucks.
27t-11t is the max-min I can go with the 105 shortcage
with a max 14t front derailleur tooth difference
back to the drawing board or I might have to pick up a mega derailleur for my haro and switch the casette to a mega range. could be interesting.
EDIT:
sorry, change the 'freewheel' on my haro.
I assume you know whether you need a freewheel or a cassette - can't be both!
I've used Megaranges in friction shift systems with no problems, with Shimano, Campy (on a 14-28, not a 13-34!), and Huret Duopar derailleurs (13/34, beautiful!!!). The tooth design on the Shimanos picks up the chain so readily that you're going to get good shifting with any rear mech I can think of that has a 34 tooth capacity and the ability to wrap chain for perhaps 38 teeth of total sprocket difference. Shimano Deores are famous for handling this sort of range, whether or not they say "mega." You WILL need a long cage design.
Road Fan