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Road - MTB drive train compatibility issues on a CX bike(6 posts)

Road - MTB drive train compatibility issues on a CX bikeD_man
May 26, 2003 10:51 AM
So I was talking to the mechanic at my LBS about moving to a triple MTB crank on my Gunnar crosshairs. Currently I am running Truvativ CX cranks w/ Ultegra rear and front derailleur (bottom pull). They said that I can't run a triple MTB crank w/o a triple MTB front derailleur and that no MTB front derailleur will work w/ Shimano STI road levers. So if I wanted to go to a mountain triple, I would need to: (1) get a MTB front derailleur (and a rear, of course due to chain wrap); (2) get a barcon type shifter for the front since the STI won't work.

Can that be right? Why couldn't I just go to an Ultegra triple front derailleur and keep my STI? Alternatively, why couldn't I just keep the double ultegra front derailluer, remove the granny gear on the MTB cranks, and run the whole thing as a double?
re: Road - MTB drive train compatibility issues on a CX bikekiwisimon
May 26, 2003 3:20 PM
Both your ideas will work. I run an ultegra triple derailler with a triple mtb crank and three rings. No problems at all.Just watch that you can manage at the back due to the extra chain links involved in the mix.
good luck
May 27, 2003 7:41 AM
Started out running an XT FD with an XT crankset on my Kelly Knobby X. No issues with shifting but the longer cage of the derailleur contact my knobbies when in the granny (Wide Michelin Muds). Although it wasn't a big problem (how often are you in the granny on a CX bike) I got an Ultegra FD which worked fine and solved the contact issue. Recently, I got a Ritchey crankset to replace the XT crankset and still no issues...

All these changes with Ultegra STI shifters...
STI and MTBatpjunkie
May 27, 2003 6:50 PM
was running Ultegra 9 STI's with XTR Crank, Fr. and Rear Der. no trouble at all. Switched to bar cons as I'm a Luddite and I don't want to drop $179 every time I drop the bike in mud. I'm just not big on STI's (Shimano in General) repair by replacement policy. find it absurd you have to buy a whole new shifter to replace a 2 cent return spring. They do work fine though
STI and MTBkiwisimon
May 28, 2003 1:47 PM
True about shimanos lack of small parts
thats why i run campy shifters
plus campys look cooler
STI and MTBatpjunkie
May 29, 2003 1:38 PM
If I was building from scratch I would have done Daytona 9 (Now Centaur) at some point may get Campy Rear der. and Camy cassettes on Shimano hub bodies so I can run the hybrid.