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Coda 94/58 bcd as compact double?

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Coda 94/58 bcd as compact double?

Old 12-31-20, 04:25 PM
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bark_eater 
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Coda 94/58 bcd as compact double?

I picked up a Cannondale Coda 200m (I think), 94/58 bcd crankset with thoughts of using it as a compact double. When it got here I was surprised to find that the base of the square taper socket is actually just proud of the innermost grannie chain ring, while the base of the socket of a SR apex looks to be close to the same plane as the largest outer chain ring. Playing around on a flat surface it looks like the relative "Q" difference between the 2 cranks, from pedal threads and the outer chain rings is 5-8mm.
So my question is: Is it worth trying to use this crank set with a short 103mm(?) Bottom bracket as a compact double? or will the "Q" factor still be as wide as running a lower "Q" road triple?

Here's the crank:



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Old 01-02-21, 08:00 AM
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Would it help if I threatened to put it on a Super Course? Or a Trek 400?
I have a set of 46+30T 94 BCD chainrings, but am suspecting that a crank made for a 135mm hub and to clear fat aluminum chain stays might not be the right candidate for a 126mm spaced road bike. Any one else been down this rabbit hole?
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Old 01-02-21, 08:02 AM
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First I’ve ever seen of that crank. Is it intended for mtbs? Crank arms 175mm?
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Old 01-02-21, 08:41 AM
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i've never intentionally set up anything exactly like that, personally. i will say, however, i acquired a ratty later 70's raleigh record that had a shimano road bottom bracket with a deore lx crank installed. the crank is all i wanted from it. at any rate, i recall the crank arm not quite clearing the chainstay. really can't say why as i never bothered to find out. i suspect if the bottom bracket were adjusted outboard a bit, it would've cleared

otoh, my super le tour has a mid 80's sugino triple crank set up as a double with a road double bottom bracket and works fine. just no granny ring. came like that from factory. iow's, with the right bottom bracket, i don't see why that/yours wouldn't work

i know....not much help, right?...lol
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Old 01-02-21, 08:42 AM
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170mm. Coda was a Cannondale house brand, this is one of the lower series ones for mountain bikes, I have another slightly different Coda 94-58T "Touring triple" one that's on a Cannondale T700. It looks to have a shorter BB spindle and a similar high Q factor, but I wont have the opportunity to pull and compare any time soon. The little bit of research I've done points to using a road double leangth BB for micro drive triples, so my hope is that a short 103mm single ring bottom bracket will give a reasonable double chain line. And that some one else may have tried this before....

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Old 01-02-21, 10:37 AM
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It'll definitely be a challenge getting a good chain line given all of that material between the smallest cog and the frame! I admire your pluck, but if it were me, I'd go with a 110/74bcd crank set up as a compact double. Lots of those out there for relatively small money.
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Old 01-02-21, 12:24 PM
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Running 110/74 as a double 46-30t with a guard instead of an outer ring is the base line to improve on. I'll probably try and find one of the Shimano touring STX cranks next, to see if their any narrower.
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Old 01-02-21, 06:48 PM
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I had a similar problem with a different mtb crank. I wanted to run a Tune BigFoot 94mm BCD as a compact double with 46-29 teeth on my touring bike which is build around an Italian road frame. The manufacturer recommends a 113mm BB if used as triple on a mountain bike. I ended up using a 6mm narrower BB on the 130mm wide frame with no issues. On a 126 mm frame you could try to go narrower than that but considering how bulky that coda crank looks it might rub against the BB?
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Old 01-05-21, 07:26 PM
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Small update on this random project. Another cheap Micro drive crankset showed up after being MIA in the Xmas mail for 3 weeks. This one has a much lower Q off the bike, and is made by SR. Its rougher cosmetically than the Coda Crank, but disregarding the Cannondale misjudgment, I'm going to get to try the 46-30t coolaid with new chainrings for less than $75. I'll probably be selling the Cannondale Coda cranks when its "safe" to go to the post office, but if any one whos interested feel free to call dibs. Heres the SR:






P.S I'm not afraid to cut and file the 58 BCD granny mounting posts off this.

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Old 01-05-21, 07:35 PM
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what is the gearing on that coda? depending on that, i 'd sure be interested!!
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Old 01-05-21, 07:49 PM
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Dibs Noted! Their 44-34. The SR rings are 42-32-22T and will probably be available. I have an other Coda touring crank that on a bike that I may want to save or swap some of the rings for, Or sell that too. I'm in one of those semi rural areas where it was fine, until it wasn't, so it might be a while.
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Old 01-05-21, 08:12 PM
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Originally Posted by bark_eater View Post
Dibs Noted! Their 44-34. The SR rings are 42-32-22T and will probably be available. I have an other Coda touring crank that on a bike that I may want to save or swap some of the rings for, Or sell that too. I'm in one of those semi rural areas where it was fine, until it wasn't, so it might be a while.
fair enough. no hurry on my end. happy to wait

and, thanks for noting
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Old 03-13-21, 01:50 PM
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Hey! How did the chainline worked out in the end? I am trying to get a decent chainline with a microdrive triple used as a double but I am unable to find a suitable candidate . I've tried a sugino impel and a shimano lx, with a 103 mm bottom bracket, both are way too far off.
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Old 03-14-21, 08:43 AM
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Originally Posted by Luc_D View Post
Hey! How did the chainline worked out in the end? I am trying to get a decent chainline with a microdrive triple used as a double but I am unable to find a suitable candidate . I've tried a sugino impel and a shimano lx, with a 103 mm bottom bracket, both are way too far off.
The SR crank had a bunch of cracked bolt holes, so I'm still looking. I think Shimano STX used 110 mm bottom brackets verses 107 on the LX, so that gives another 1.5 mm advantage on the chain line.
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Old 08-16-21, 02:34 PM
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Just a quick update. While I changed directions with the bike this was originally going to use a 94bcd double on, I did just end up with a Shimano STX FC-MC34, which when quickly compared to the Coda crank looks to have at least 10 mm less "Q". I haven't decided what to do with it yet. My drivetrain test bike has buggered and re-tapped bottom bracket threads so I'm a bit hesitant to swap in a shorter BB. I also haven't forgot about Mr. Thook's dibs, but I have not had a chance to see if the Coda will work on one of my other bikes as a triple.
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Old 08-16-21, 03:10 PM
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Just catching this thread for the first time. 94mm BCD makes a lot of sense, especially for today's "sub-compact" gearing. Shame that it's not more widely used.

103mm might be a bit tight, but I think 107mm has a good chance of success here. Try it!
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