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  1. #1
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    Hollowgrams installation help - Seals

    Need help with Installing new SL Hollowgrams on my Flash Carbon 29er 2011
    I am leaving the stock Sram BB30 installed, as well as the stock SRAM Bearing shield covers the standard plastic spacer and just the single wavy washer. The spindle is the standard 132 mm,
    My question is regarding the Seals - per the Cannondale Installation manual , a seal is required for MTB applications just in between the baring and the shield on both drive and Non-Drive sides.
    See attached images- item #1 in the top image and #9 in the bottom one
    Is that requirement specific to Cannondale shields or does it apply also to the SRAM ones.
    I believe someone mentioned in another thread that the Cannondale shields are different than the SRAM ones.

    Hollowgrams installation help - Seals-11-10-2013-2-38-04-pm.jpg

    Hollowgrams installation help - Seals-11-11-2013-12-12-11-pm.jpg
    Flash29C2
    Scalpel 29C1
    Niner One9 SingleSpeed RDO fork
    Supersix Evo 1 Hi Mod D/A

  2. #2
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    To be honest, I have never really used those little rubber seals, they're not required, and I have never noticed a problem with not using them. They indeed are specific for Cannondale shields though. The SRAM shields are different and already have their own seals. You can definitely use the SRAM BB and shields with your Hollowgrams. Just remove old cranks and install the Hollowgrams. Just make sure you use the proper number of spacers to get the correct preload on the Wave washer.

  3. #3
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    Thanks Trauma-MD

    1."The SRAM shields are different and already have their own seals."
    In what way ? The shields are one piece with some grooves on the back - do you refer to those grooves as seals ?
    Name:  11-11-2013 7-05-58 PM.jpg
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    2. "Just make sure you use the proper number of spacers to get the correct preload on the Wave washer. "
    a. How do I know what is the correct preload ?
    b. When you say "spacers" Are you referring to the 0.5 mm shims
    Cannondale BB30 Shims Set of 5 - QC617 - CannondaleExperts.com

    This is how I installed it on the drive side: from inside to outside SRAM Shield, 12m spacer and finally the wave washer.
    Flash29C2
    Scalpel 29C1
    Niner One9 SingleSpeed RDO fork
    Supersix Evo 1 Hi Mod D/A

  4. #4
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    1. The SRAM BB30 bearings have their own rubber seal (it covers the outer diameter mostly) that has a pretty tight attachment to the bearings, you often have to use a small pick to remove it. The SRAM bearing shields account for the shape of that rubber seal, so the Cannondale shields can only be used if you remove this seal (but they can be used if you want to).

    2.a. & b. Yes. the small 0.5mm plastic shims. You want to use enough to mildly deform the wave washer when the crank is installed. Meaning, make sure it compresses some but not so much that it is completely flat. As stated in the diagram you posted above..

  5. #5
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    Thanks
    My Bearing don't have those seals...
    Maybe it is not SRAM after all ??? - the original crank that was installed on that bike was an FSA SL-K 386 BB30
    My LBS replaced it to S2210 due to chain sucks issues.
    Flash29C2
    Scalpel 29C1
    Niner One9 SingleSpeed RDO fork
    Supersix Evo 1 Hi Mod D/A

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