I have a MTB that I'm building up with dirt drops and STI levers. I need to make the road triple levers work with an XT front derailleuer. Apparently shimano uses a different cable pull length between their road and mountain triples. Does anyone know where to find the cable pull lengths for these two shifting systems so I can calculate the ratio and make myself an adapter pulley. JTek makes a shiftmate straight pulley for doing this but the cable routing on this bike leaves me with nowhere to mount it so I have to go custom (and custom will be financially cheaper since I have access to the tooling to do it).
I've had a bunch of gotcha moments with this build and am really wishing I'd just gone with barcons and Tektro RL520 levers but at this point I'm too far into it scrap what I've got and rebuild. I may do it anyways if these STI levers are too problematic with the dirt but not today.