Should be no issues putting the 10-sp crank on the 9-sp drivetrain. Going the other way could pose some problems.

Going compact might pose a problem if you have a braze-on fr der hanger. Right now, mine is bottomed out with a 52. If I went compact, I'd have so much clear blue sky between the der cage and the 'ring that shifting would be dicey.

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Some are born to move the world to live their fantasies...

https://triomultisport.com/
http://www.mjolnircycles.com/

To my knowledge, FSA is the only company making compact cranks with the outboard bearing system. No other crank will be compatible with the BB cups that are on your bike though . . . the entire system will have to be replaced.

Yes, you can use your Ultegra10 crank with your 9 speed setup. Your drivetrain might be a bit louder than it was before.

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Dimond Bikes Superfan

just swap out your cassette if you need lower gearing and keep the crankset as is -- take a look at gear development charts to see that the you get as much out of a 12/25 and 12/27 as you would from a compacts with 11/23 or 12/25.

Ok here are you options for outboard bearing BB with compact cranksets as far as I know:

1. FSA Compact MegaExo crank/BB (i.e. gossamer megaexo, k-force megaexo). These use outboard bearing BB is very similar (and compatible according to some) to the shimano 10 speed BB. When you purchase a FSA megaexo crankset, the BB comes with it.

2. Truvativ Giga X Pipe compact cranks (i.e. Elita, Roleur). The Giga X Pipe BB and crank setup also uses outboard bearings similiar to the shimano 10 setup. I believe that these are NOT compatible with the shimano BB.

FSA makes a front derailleur for compact cranksets so that could be a solution should you run into front derailleur setup problems.

Personally, I use the FSA gossamer megaexo (noncompact) and am extremely happy with them. My brother uses the Truvativ Giga X Pipe Roleur setup and he only has good things to say about it. The outboard bearings in my opinion make a significant difference in terms of stiffness and ease of installation. I havent personally tried the FSA front derailleur yet.

wilson

Hey, thanks for the tip on the FSA ft der. I'd been toying with the idea of going compact to get a little lighter, but when I saw how much (lack of) adjustablity I had in that direction, I kind of scrubbed the idea.

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Some are born to move the world to live their fantasies...

https://triomultisport.com/
http://www.mjolnircycles.com/

Shimano has a compact crankset w/ outboard bearings in an Ultegra level quality for '06. Be patient.

Your 10s crank will work with your 9s bike.

Ritchey makes a compact crank that will fit onto your Ultegra 9 speed Octalink BB.

You could swap cranksets and use the old BB in the new bike with a Ritchey crank. That would get it done cheapest/quickest.

-SD

what about putting a compact crank on a dual? with the braze on front derraileur is that possible?

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"the trouble with normal is - it always gets worse"

- Cockburn

No problem with the Dual. I have compacts on mine right now and it works great. I am just running a Shimano Ultegra Del and it works fine with the Compact Cranks. I am using the FSA Energy compacts right now but switching them to my new cross bike and getting the FSA Gossamer MegaExo for the Dual. I already run a pair of the FSA Gossamer MegaExo on my road bike and they are great.

thanks!

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"the trouble with normal is - it always gets worse"

- Cockburn