MTB derailleur on road bike

[Becky]

Can a triple STI work a FD double? I assume I need a new shifter?

Anyone know where that old thread is?

Usually, the answer is yes. I intentionally set up my compact double bike with triple shifters and a triple front derailleur. It just requires proper adjustment of the limit screws to basically eliminate that third click.

I would give it a try. If it doesn't work, you can look for a double shifter.