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  1. #1
    Bike Breaker.
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    New question here. RF Atlas or BB prob

    What causes this?

    The crankarms are stif to turn but with no gritty feel? It's an Atlas chainset and RF bb.
    It's a 73mm width and the mechanic seems to have used the correct spacer? Is it caused by the plastic washer being crushed? It certainly robbed me of power on my ride today?

  2. #2
    mtbr member
    Reputation: Deanoldo's Avatar
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    Quote Originally Posted by catnash
    What causes this?

    The crankarms are stif to turn but with no gritty feel? It's an Atlas chainset and RF bb.
    It's a 73mm width and the mechanic seems to have used the correct spacer? Is it caused by the plastic washer being crushed? It certainly robbed me of power on my ride today?

    Check out page two of the installation guide, there's a section in the troubleshooting part that talks about excess rotational stiffness. I had the same problem when I assembled mine and had to take out one of the washers because it wasn't allowing the bolt to cleanly bottom out.

    http://www.raceface.com/tech/inst/Ev...asCrankset.pdf

    Dean

  3. #3
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    Quote Originally Posted by catnash
    What causes this?

    The crankarms are stif to turn but with no gritty feel? It's an Atlas chainset and RF bb.
    It's a 73mm width and the mechanic seems to have used the correct spacer? Is it caused by the plastic washer being crushed? It certainly robbed me of power on my ride today?
    Sounds like too much preload on the bearings and a spacer/washer needs to be removed. The rubber washer will eventually crush out and make the crank easier to spin but if its really bad i'd have the preload redone.

  4. #4
    ups and downs
    Reputation: rockyuphill's Avatar
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    Yep, likely one too many of the 1mm rubberized spacers in there. I had that problem with my Deus cranks, I removed the extra 1mm spacer on the drive side and it was all magic and smooth.

  5. #5
    The devil is an angel too
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    Sounds like too much preload to me too. It could be that your BB is slightly out of spec (not exactly 73mm but may like 74mm) RaceFace recommends that you try removing one spacer, from the non-drive side so your chainline doesn't get messed up. Try that and see what happens
    Art is the most intense mode of individualism that the world has known.

    Oscar Wilde

  6. #6
    Bike Breaker.
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    Cheers

    Thanks Guys, You have sorted it out for me. It felt like I was riding thre gears harder. Will stripp the cranks of later and print that pdf file.

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