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MTB derailleur on road bike

MDHillSlug2010-12-12 16:22:27 +0000 #1
I'm contemplating the idea of switching from a triple crank to a compact double with a 32 cog in the rear. I understand I would need a long cage top normal derrailleur but I'm confused if these are normally compatible with STI road shifters. Does anyone know what I'd need to be looking for?
sarahspins2010-12-12 16:27:17 +0000 #2
There was another thread about this a while back, if you have a GS (long cage) rear derailleur (which is common on triples) you might not need a MTB derailleur.

The indexing is the same for road or mountain (as long as your new cassette has the same number of cogs).. so shifting shouldn't be impacted if you did swap out the derailleur.
Cataboo2010-12-12 16:30:48 +0000 #3
Quote:

Originally Posted by MDHillSlug

I'm contemplating the idea of switching from a triple crank to a compact double with a 32 cog in the rear. I understand I would need a long cage top normal derrailleur but I'm confused if these are normally compatible with STI road shifters. Does anyone know what I'd need to be looking for?

mtb rear derailleurs will work with road shifters.
MDHillSlug2010-12-12 16:52:22 +0000 #4
If my existing RD will work, I still need:

Cranks

Bottom bracket

Can a triple STI work a FD double? I assume I need a new shifter?

Anyone know where that old thread is?
Becky2010-12-12 16:43:27 +0000 #5
Quote:

Originally Posted by MDHillSlug

Can a triple STI work a FD double? I assume I need a new shifter?

Anyone know where that old thread is?

Usually, the answer is yes. I intentionally set up my compact double bike with triple shifters and a triple front derailleur. It just requires proper adjustment of the limit screws to basically eliminate that third click.

I would give it a try. If it doesn't work, you can look for a double shifter.
sarahspins2010-12-12 17:07:45 +0000 #6
Cataboo2010-12-12 17:53:12 +0000 #7
Quote:

Originally Posted by Becky

Usually, the answer is yes. I intentionally set up my compact double bike with triple shifters and a triple front derailleur. It just requires proper adjustment of the limit screws to basically eliminate that third click.

I would give it a try. If it doesn't work, you can look for a double shifter.

Oooooh... I could get rid of my triple and make it a compact double with the fsa gossamers I took off my litespeed...

But then, I've got 2 sets of carbon triple 165 cranks that I feel obligated to use on something.

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