Hi - I have a Lemond Nevada City that I refuse to get ride of but the Sora Shifters need to go. I'm curious if 105 Shifters or even Ultegra shifters are compatible with a 9 speed rear Tiagra derailleur? The front derailleur is a Sora 3 chain ring. The chain is a SRAM something (that I don't mind getting rid of for something with a master link).
Here's the what comes stock:
Brake Levers: Shimano Sora STI Dual Control
Front Der: Shimano Sora Triple
Crankset: SR Superbe, 30/42/52 teeth
Rear Der: Shimano Tiagra SS
Any thoughts or advice (even outside of what I'm suggesting) would be greatly appreciated. I don't have the $$$ for a total upgrade for what it's worth...