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breadrunner said:
In the vast awareness, are there any qualified to speak to the problems I will encounter when I try to install a Coda 2X9 crank on my 8-speed 105 roadie? I anticipate shortening the chain, unless I should replace it altogether with a 9-speed chain. I know I will need a new splined BB to replace the square taper in there now. The old 105 crank is also a double, 52/39. The new Coda is a 44/29. 10-Q
Your front derailer cage has the wrong curvature for a 44 ring,but if you can get it low enough it may still shift. I have used a standard road FD with a 46 ring,so there is some latitude. An 8 speed chain will work, but so will a 9 speed.
 

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2x9

TurboTurtle said:
A 44/29 is either 2 rings of a MTB triple or a compact. What is the bolt ring diameter. What BB spline does it take? Shimano MTB, Shimano road, ISIS, C'dale propriatory? What is 10Q?

TF
There were 2x9 MTB setups. Cdale also offered cranks using the octalink spline.
 

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Rings

breadrunner said:
In replacing the steel (?) rings on this crank with bigger, is it advisable to go to alum. for quiet trail riding? What brand is most compatible?
You neeed to match bolt pattern and Bolt Circle Diameter, and be sure you are going big enough to get derailer close enough,then see what is available. A bigger big ring might mean the need for a bigger small ring if too big a spread gets you in derailer capicity trouble. A pinned and ramped big ring will make for better shifting. You might be ahead to start with a more suitable crank,IMO.
 
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