STI married to Deore + FD?

Aushiker · 10-27-2008, 11:51 PM

G'day
Does anyone know if a STI shifter (e.g., Tiagra/105) with a Deore or higher spec FD/Crank? If you have done it, has it worked okay?
Andrew

Bill · 12-03-2009, 04:19 PM

Aushiker did you find out this answer? Be interested in knowing the results myself.

cyclerUK · 12-03-2009, 06:03 PM

STI shifters don't work with MTB (deore etc) front derailleurs.
STI pull about 1/2" of cable per click. (that is a 3 position type)
MTB use about 3/4" cable pull.

(I believe, but not seen, some newer Shimano left STI have a multi click action which might work?)

You can use a road triple FD with a Deore crankset but you have to be careful with the diameter of the rings. Some road FDs are meant for larger chain rings such as 50+ and if used with small MTB rings the FD can't be lowered enough without hitting the chainstay.

Aushiker · 12-03-2009, 09:34 PM

(12-03-2009, 04:19 PM)Bill Wrote: Aushiker did you find out this answer? Be interested in knowing the results myself.

Hi

Yes. I posted the summary findings at http://www.aushiker.com/2008/11/surly-long-haul-trucker-lht-touring-bike-a-first-time-build-experience#Drivetrain.

Regards
Andrew

Bill · 12-04-2009, 08:12 PM

Wow that is pretty cool trick. Nice bike by the way. Thanks for sharing.