Just bought a (second hand) 105 triple chainset as my existing compact double wasn't for me. However, and I should have checked this before, the Sora STI will only index for a double, despite having space on the gear indicator for three chainrings. There's nothing I can do about this, is there?
is it all cabled up still - sure it's not the stops on the mech itself preventing the shifter from operating. or a double specific mech? If you undo the cable from the mech can you get three indices then?
I'll give it another go, I loosened up the stop screws and gave the STI a good yank but there wasn't anything there clicking or holding it in place at the spot where the third index should be...
triples eh 😉
Haha! I was waiting for that^ 🙂
just edited it as I though you might get shirty about it....
Have you disconnected the cable from the mech, then checked the shifter has 3 stops yet?
If the shifter was in the "middle" and you set the travel it would look like you only had a double.
It looks like I've got a double. I'm not a shirty kind of guy! 😉
fate in telling you to go with two rings, better shifting, less hassle, less weight, and become a man my son.