Make sure you know which direct mount you need. There are three types. The first link above is the single bolt high direct mount (Shimano style). Nothing at all like the two bolt low direct mounts (one of which is the E-type FD without BB bracket).
Have:
2012 Scalpel frame that takes direct mount derailleurs.
XT Rapid rise rear derailleur, 9 speed.
Do not have:
Front derailleur, direct mount.
Crankset.
The latter two I need to match up with what I have to make it all work, did that make more sense? As long as it all works together it does not matter to me wether it's a 2x9 or 3x9.
I'm tempted to just go XX1 and keep it simple, derailleurs make me go :madman:
Since you've already got a 9-speed XT on the back, you need Shimano 7- 8- or 9-speed shifters. I'd just do 9-speed. I'd be leaning toward SLX or XT. But Deore and down work fine too.
I haven't tried to mix a 10-speed crankset and front derailleur into a 9-speed drivetrain. According to the sticky, it "should" work - need to match the crankset and derailleur. In that case, Shimano's got you well covered.
For 9-speed, Shimano's not listing the older versions of the now 10-speed drivetrains on their web site anymore, and I'm too lazy to research it. From memory, there were a ton of options in SLX. I'd look for a direct-mount derailleur (or E-type and remove the bracket) to have been offered in SLX. Probably at least some of that stuff was XT and XTR too. Working down the chain, pickings get slimmer. SLX 9-speed included a double crank, and some double-specific front derailleurs. So if you wanted to do double, that'd be where to look. Use Google Shopping and refine by the stuff you need for compatibility if it doesn't just show up right away.
For the sake of paranoia, I'd probably try to just do everything 9-speed (or fewer) since I know that it works. Or, figure the 9-speed rear derailleur isn't enough to have in hand to make piecing together the rest of the drivetrain around it worthwhile, and buy a full drivetrain kit somewhere. Either 9-speed or 10-speed.
The shifter mounts on the bar. There are flat bar road shifters but most mount on dropbars.
Road front derailleurs are not usually suitable for mtb doubles because of the difference in chainring sizes, chainstay clearance, differences in cable pull, and they will not fit with any style mtb direct mount.
I'd be inclined to do some homework over that one.
First of all, I don't care if I have an extra shift - I'll run a double derailleur with a triple shifter. I've heard that Shimano wasn't even making double road shifters for a while, but it's possible to trash a triple shifter by forcing the third, locked-out shift if it's driving a double derailleur and crank.
The other problem you may run into is that supposedly the pull ratios between road and mountain front derailleurs don't quite match.
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