Originally Posted by
rochesterboy
The compatibility chart is awesome.
Shifters: Shimano Ultegra Di2 6770, Electronic
Front Derailleur: Shimano Ultegra Di2 6770
Rear Derailleur: Shimano Ultegra Di2 6770
It looks the above is what I need if I go with all electronic route. I don't see a whole lot of info on Giant 2013 Defy Advanced 0 to decide if I could use manual shifters. I am still trying. Thank you.
I’m pretty sure you can use this frame with mechanical shifters too. Easy way to check is to look at specs for 2013 Defy Advanced 1/2/3 etc using the same frame. The 0 was the highest component spec in the line, hence electronic. But the lower specs would almost certainly be mechanical. The current Defy Advanced Pro still supports mechanical shifters, so this older model almost certainly will too.