Join Date: Dec 2009
Location: Melbourne, Oz
Mentioned: 2 Post(s)
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Seems odd; when STIs fail they usually don't want to release the cable. What happens at the lever when you try to shift to the big ring? Does it move at all?
Ensure that the indexing isn't out by pulling on the cable and trying to shift to a ring below your granny ring. If the lever shifts and you can pull the cable a good distance from the frame, the fix is as simple as pulling more cable through your derailleur's pinch bolt.
However, I'm guessing there's a good chance that pushie's a bitsa and the lever isn't for a triple... if it shifts reliably through two positions, it should shift between three if it has them. Ensure it really is a triple shifter before... hang on. Deore is MTB gear, innit? Did Shimano use the STI acronym for that too?
So I guess that rules out a double lever... I'd say Rapidfire has pretty much the same guts as STI, meaning you may enjoy success by flooding the mechanism with as much degreaser as you can get in there. If it starts working, let it dry out some and lube it with heavy oil. If that doesn't do it, it's prolly junk unless you have what it takes to defy what is basically a 'no user-serviceable parts inside' situation.