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so i'm upgrading my drivetrain this spring from the crappy sora groupo that came w/ my bike. so far i have an ultegra casette (:yourock: el chup) and 105 rear derailleur.
So, I've been checking out 105 levers on ebay, and they seem to say that they support both 2 and 3 gear cranks. how does this work?
Once i have 9-speed levers, i should be able to continue to use the sora front der and 3-speed crank until i find good deals on those parts, right?
pardon my JONG :rolleyes2
You can't push the FD past the limit screws, so the third click never gets used.Quote:
Originally Posted by ninjabirdman
You can do the same thing with trigger shifters on a MTB: lots of people run 2 rings + bashguard, but there aren't any 2-ring shifters anymore.
Rear deraileurs are either long cage (triple) or short cage (double). If your new deraileur is a short cage, then it might have trouble taking up the chain slack.
Also if you are considering switching to a double, you should also replace the bb and front deraileur, since theese are also double or triple specific.
wow, the RD is really different depending on front crankset? i thought shimano derailleur sets usually had 3 part nos . . . RD, 2FD and 3FD?
in any case, I like the flexibility of a 3-gear front crank and the extra weight builds character anyway. i was mostly trying to figure out if I was going to have to adjust the left lever into 3-gear mode
The issue is how much cable the derailleur can pull -- which must be at least the difference between the small-small and large-large gear combinations. That's why you have short-cage and long-cage derailleurs.Quote:
Originally Posted by ninjabirdman
The reason everyone doesn't just run long-cage is that the short-cage versions shift more quickly, don't bend as easily, and weigh less. A lot of DH mountain bikers actually use short-cage road derailleurs since they've only got 1x9.
how can i tell the difference?
if it looks "long"? :the_finge