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  1. #101
    Senior Member
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    Sep 2009
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    Central Illinois
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    Trek Speed Concept 9.9, 2011 Calfee Tetra Tandem
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    Quote Originally Posted by sinkr8 View Post
    Amen. Just because they designed a new system that will stay on the pulleys doesn't mean they addressed alignment issues specific to the frame and cranks! That's the beauty of chain drive, its very tolerant!
    The CDX system is supposed to be able to absorb some misalignment.

    I use the iPhone app and ours only varies a few hz as I rotate the cranks.


    BTW Dilbert is not always right.

  2. #102
    Senior Member
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    Sep 2009
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    Central Illinois
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    Trek Speed Concept 9.9, 2011 Calfee Tetra Tandem
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    Quote Originally Posted by sinkr8 View Post
    Hi Folks,
    I'm new on the list, and have read a lot!
    I'm trying to update our 2009 Cdale. Co-Motion has/had a sale to close out the Gates CDC system. I thought, "what the heck" and purchased. Now I am having some difficulties with install...of course I'm hoping someone will set me straight.
    Equipment:
    FSA Gossamar cranks
    FSA MegaExo BB.
    Cannondale dual-wedge ECC

    First question: I am using the iPhone app for tension. I tested with the cranks in various positions to see what the range is and expect some differential in tension. I am getting a 15hz variation i.e 50hz in one position vs. 65 in another. That seems significant to me especially since the Gates App indicates a 5hz variation between "lightweight" and "big and powerful" for tandems.
    I have repositioned the front pulley on the spider to see if it changed, it didn't have a noticeable impact.
    What kind of hz ranges are others getting with this App?

    Second question: Alignment. If I can rotate the cranks forward and backwards without the belt walking off, is that considered aligned? I believe I can hear the belt rubbing against the flange of the pulley but I currently have the system "aligned" such that the belt will not walk off while on the stand but have not ridden it.
    I ask this question after investing a significant amount of time trying to attain alignment. I am using the ECC to attain aligment though I do have some option with shims. Once I get the alignment set I have to rotate (using a pin spanner) the ECC for tension, the ECC "walks" in the BB which throws off the alignment. If I'm lucky and get the tension acceptable (see above) and the alignment is still good, I have the challenge of tightening the ECC which again may cause the alignment to shift ever so slightly...and the belt will wander.
    Am I the only one pulling my hair out? - technically not my 3rd question...
    Any insight appreciated!
    I just looked at the co-motion website and they are selling the CDC system for $195. I paid $245 for the CDX system directly from Gates.

    Just saying!

  3. #103
    Senior Member
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    Quote Originally Posted by uspspro View Post
    I love Calfees, but that is totally lame. Imagine if you have ordered with a chain drive, they may have not discovered this. My front water bottle mounts are crooked. One day I will bring the frame back to fix it.... but still that kind of stuff should not happen.
    You are not alone, my front bottle mounts are crooked too, the bottle is the angled slightly clockwise. I tried adjusting it using the slop in cage mounting holes but it didn't help much.
    Also they put the mounts too high up on the downtube, had to go to a side loader cage to get the bottle in and out.
    Guess I can't complain since the bike rides like a dream and for the most the construction is as good as it gets.

  4. #104
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    Quote Originally Posted by sinkr8 View Post
    Thanks Turbo,
    That is what I needed to hear.
    On a couple occasions I did manage to get it aligned perfectly such that it was not rubbing on either flange at which time it was very quiet and smooth! Alas, the alignment was not quite right and it would walk off the stokers pulley. On this CDale there is only about 2mm clearance between the stoker pulley and the chain stay so it really cannot walk off but is can rub if misaligned. My back pedaling comment was driven off of what i read on the Co-Motion FAQ's page and another comment I read which indicated a perfect alignment would allow both forward and back rotation but maybe that is pie in the sky...
    As an additional comment on the tension challenge, I find it amazing the either the belt or the pulleys cannot be manufactured (economically?) to a higher tolerance such that the variation is minimized.
    I will get things aligned and tensioned and give a report back.
    Thanks again.
    I managed to get the belt alignment pretty darn close. Back pedaling a bit will still cause the belt to wander off of the stoker pulley to the point it will rub on the chainstay. The ECC protrudes from the BB on the drive side about 1-2mm. I may get a spacer and make it right but its working for now. I was able to attain a reasonably consistent tension but still quite a bit of variability in my opinion!

    Yesterday we managed a 25 mile ride with a lot of stop and go as well as a solid hill. All I can say is that it worked flawlessly and is amazingly quiet!

  5. #105
    Senior Member Turbotandem's Avatar
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    Nov 2011
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    Boulder, CO
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    Paketa V2r di2, C-Dale MT 3000, Teesdale, 1963 Huffy Daisey
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    Quote Originally Posted by sinkr8 View Post
    I managed to get the belt alignment pretty darn close. Back pedaling a bit will still cause the belt to wander off of the stoker pulley to the point it will rub on the chainstay. The ECC protrudes from the BB on the drive side about 1-2mm. I may get a spacer and make it right but its working for now. I was able to attain a reasonably consistent tension but still quite a bit of variability in my opinion!

    Yesterday we managed a 25 mile ride with a lot of stop and go as well as a solid hill. All I can say is that it worked flawlessly and is amazingly quiet!
    We had a tape dot on the chain stay right at that point where the belt might rub when we back pedaled. With CDX no longer needed.
    As metioned above in the string, a dry film silicone spray from an auto parts shop is used for belts in cars. Great for the cardon drive belt. For the CDC especially it was nice to spray it from above the teeth and a little from side such that it coated the side face of the belt that rides against the flange of the CDC, as well as on the teeth. Spray liberally, a couple rotations of the belt. Don't skimp on it, it wears off in a month or so from abrasion and/or rain. That removed any residual squeek.
    Andy
    Boulder Colorado

  6. #106
    Senior Member Bent In El Paso's Avatar
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    Nov 2009
    Location
    El Paso, TX
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    Co-Motion Speedster Co-Pilot
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    As others adopt the new Gates Center Track belt drive I am sure some will run into the issue of the Garmin cadence magnet interfering with belt. The center track belt is positioned in a more outboard position then the older CDC belt drive system. I have found a nice solution to this problem. I apologize for the poor photo quality. The batteries for the camera were dead, so I took these with my phone.

    I ordered 1/2" X 1/4" X 1/8" rare earth magnets. I had to order 10 but they were less than $10 for the bunch.

    51GSTBruE+L._SL500_AA300_.jpg

    Here is the image of a single magnet...

    photo 1.jpg

    The magnet was then placed on the inside of the stokers left crank on the end of the pedal spindle...

    photo 3.jpg

    As you can see here, there is good clearance between the belt and the magnet...

    photo 2.JPG

    It is recommended to go with the ring-shaped magnet vs. a disc-shaped magnet. These babies are really strong and the ring allows you to use a small screwdriver to remove it from the spindle. The disc could lead to damage of the cranks while trying to get a tool behind the magnet for removal.

    The magnet is strong enough that the Garmin cadence sensor picks it up easily even though there is considerably more clearance than with the original magnet.

    I hope this is helpful for others who may run into this same problem in the future.
    Fred

    Behind every good captain is a great stoker!

    Co-Motion Speedster Co-Pilot

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