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  1. #1
    Senior Member WNY tandem's Avatar
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    Upgrading Crankset Question

    I'm having a problem with my Stokers Crankset (seems to be slightly bent), so I'm looking to upgrade my cranksets. I have a Co-Motion Speedster with Raceface 9 speed cranks and I'm looking to upgrade to the Shimano R601/602 cranksets. Since the new cranksets are 10s compatible, will I have any problems installing them with 9 speed derailleurs and a 9 speed chain?

    Any other problems you might see me having changing from Raceface to Shimano cranks?

  2. #2
    Senior Member WNY tandem's Avatar
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    Another option would be to upgrade to the FSA SL-K Light cranksets instead of the ultagra set.

    And as long as I am upgrading cranks, I'm thinking about also upgrading to a Gates Center Track Belt Drive.
    So would one upgraded crankset be better to use with the Belt drive from the other?

  3. #3
    Gear Combo Guru Chris_W's Avatar
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    Personally, I would go with the Shimano because I find that their bottom brackets and chainrings perform better than FSA's. However, if you want to change chainring sizes then that is far easier to do with the FSA cranks.

    For the belt drive, the timing side chainline is officially 53 mm for FSA cranks and 50 mm for the Shimanos. Either of these SHOULD be OK for chainstay clearance for a Co-Motion Speedster with the CenterTrack rings, but it's hard to know that until you have mounted it up or if someone else can share their experience with the same combination.

  4. #4
    Clipless in Coeur d'Alene twocicle's Avatar
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    Quote Originally Posted by WNY tandem View Post
    Another option would be to upgrade to the FSA SL-K Light cranksets instead of the ultagra set.

    And as long as I am upgrading cranks, I'm thinking about also upgrading to a Gates Center Track Belt Drive.
    So would one upgraded crankset be better to use with the Belt drive from the other?
    First off, it's Shimano R601/603 not Shimano R601/602.

    I have to disagree with Chris about going Shimano in your case, because if you intend on using a 9spd chain it will not work with the ramp pins on the Shimano 10spd. The spacing between the middle and big ring with the pins has very close tollerances, which means a 9spd (wider) chain will snag on those pins and perform badly. It is difficult enough to get the 10spd chain to not chime on the pins (need to pay close attention to achieving near perfect chainline).

    On a more equal footing for pricepoint and weight would be the FSA SL-K cranksets. FSA SL-K Light is some 300gms lighter than the Shimano set, but you are looking at $1080 for the SL-K Light version. I purchased my Shimano Ultegra set last spring from ebikestop.com (a Colorado Springs brick and mortar store) for $800. I believe the standard FSA SL-K are somewhere between in price.

    FSA cranks also have a bit more wiggle room for crank alignment, which may be something you need for your frame, especially for a belt drive. Even though the CenterTrack setup is not as touchy as the previous version for alignment, you should still try to get the timing rings setup as close to perfect as possible otherwise the center ridge and belt groove on the two rings will work against each other (you can hear more belt noise when misaligned).

    Between these specific crank selections, my recommendation for you is to look at the FSA SL-K and/or Light. Which version depends on your pocketbook.
    Last edited by twocicle; 02-24-13 at 10:07 AM.

  5. #5
    Senior Member WNY tandem's Avatar
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    Thanks for the insight.

    Twocicle: I was thinking the same thing about the FSA's. I was able to find and purchase a set of FSA SL-K Lights last night for $770 (I had to buy the Stoker & Captains cranksets from separate sources to get the cheapest prices). Now I have to track down the best pricing on a Gates Belt Drive set-up.

  6. #6
    Clipless in Coeur d'Alene twocicle's Avatar
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    Quote Originally Posted by WNY tandem View Post
    Thanks for the insight.

    Twocicle: I was thinking the same thing about the FSA's. I was able to find and purchase a set of FSA SL-K Lights last night for $770 (I had to buy the Stoker & Captains cranksets from separate sources to get the cheapest prices). Now I have to track down the best pricing on a Gates Belt Drive set-up.

    Great price if that is indeed for the "Light" version. Based on the availability from the sources you provided (PM) the set appears to be the standard SL-K and not the "Light". If so, check out TandemsEast pricing for FSA cranksets.


    FSA now shows the "Light" set at: MegaExo: 1571 g (Set), though I'm not 100% certain they include the BBs in that weight measurement. When you get them, post the actual weight of yours.

    FSA also shows their default ring setup is 52/39/30T, which is the same configuration as the Ultegra, but the FSA has a more standard 130/74 BCD which is more standard than the Ultegra BCD setup. Some people want a taller big ring, while others want a smaller inner. Your front shifting performance will depend on which derailleur you choose and the gap-steps of your rings. For example, Peter White comments on this issue, but references the Ultegra 6600 triple FD and not the newer 6703 Triple, so I'm not sure if his statements hold true with the newer FD model.
    Last edited by twocicle; 02-24-13 at 10:39 AM.

  7. #7
    Senior Member WNY tandem's Avatar
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    Update: The FSA SL-K Light cranksets are installed with a Gates Carbondrive Center Track Timing Belt. I'm still running my 9 speed chain on the drive side and since the FSA Chainrings are setup for a 10 speed system, I had chain rub on the large chainring when running middle chainring with small cog. So I had to add spacers to large chainring to push it out slightly and all is well now! Hopefully we can get out for a short test ride soon.

  8. #8
    Senior Member WNY tandem's Avatar
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    We took it out for a test ride today (first chance we have had) and everything is working great! My wife even commented how smooth and quiet everything was compared to the old setup!

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