Originally Posted by
ls01
sora, tiagra, 105, ultegra ( 600 if older, this is where ultegra came from) Dura ace.
105 and higher have paddles. Tiagra and Sora has thumb button.
Incorrect. The most recent reincarnation of Tiagra has paddles like 105+. It also has a gear indicator built into the top - Source:I just sold a set...