Join Date: Jan 2008
Location: Beaverton, OR
Bikes: 2013 Kona Jake, 2015 Kona Jake the Snake, 2008 Kona Major Jake, 2013 Kona Jake the Snake, 2006 Kona Kula, 2012 Ridley Excalibur, 2001 LeMond Buenos Aires, 1984 Pinarello Gran Turismo, 1982 Trek 614, 1978 Austro-Daimler, 1987 Pinarello Montello
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I've got a 29er that I put drop bars on, and I'm using Tiagra shifters with an XT front derailleur, though I've got it set up for bottom pull. It actually works pretty well for me. When I have it in the stand, the chain rubs the derailleur a bit at the two extremes -- i.e. small chain ring with the big cog and the big ring with the small cog (yes, the pairings that are supposed to work) -- but I don't noticed it on the road. The top pull cable routing might complicate things.
If you try this, I would definitely recommend getting some kind of inline barrel adjuster because you have to have the cable tension just right.
Double front rings would solve the problem, as would bar end shifters in friction mode. There's also an adapter you can buy (from JTek, I think) to get the road shifters to pull the amount of cable that a MTB derailleur expects.