Need Help with Gary Fisher Rig Crankset and EBB bottom bracket removal- Mtbr.com
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  1. #1
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    Need Help with Gary Fisher Rig Crankset and EBB bottom bracket removal

    I have a single speed Gary Fisher Rig 29er (circa 2008) with eccentric bottom bracket. I managed to remove the non drivers side crank arm with a crank puller. At this point I thought I could simply pound the splined part so that the remaining crank assembly would slide out the other side - however, after pounding with the mallet multiple times, the crankarm does not seem to be budging.

    After a bit of online research, I found reference to some bottom brackets that had the splined part integrated - can someone confirm that the Gary Fisher Rig is this type?

    If so, I'm assuming I could remove the drive side crank arm with crank puller too, then loosen the EBB with allen key, and the EBB would then be removable?

  2. #2
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    I just went ahead and removed the other arm with the puller. Then I loosened the EBB and the bottom bracket just slid out as I suspected. I'm assuming the splined extensions are integrated into the bottom bracket - hopefully I didn't do any damage with the rubber mallet.

    Any suggestions on servicing the bottom bracket?

  3. #3
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    photos?

    does the crankset say "GXP on it anywhere?

  4. #4
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    Nope - no GXP crankset text.

    As mentioned, I removed the other crank arm and the bottom bracket assembly slid out. It would be great if someone can confirm that the unit is sealed or is there a way I can easily access the bearings to lube them?

    I'll likely leave as is (bearings don't feel too bad)... I've already disassembled the wedge part and re-greased everything. I'm assuming, the wedge doesn't need to be aligned with the holes in the bike frame (see the last pic)?

    After removing both crank arms, the bottom bracket slid out (non drive side):
    Need Help with Gary Fisher Rig Crankset and EBB bottom bracket removal-rig8.jpg

    Picture of EBB fully removed
    Need Help with Gary Fisher Rig Crankset and EBB bottom bracket removal-rig6.jpg

    Picture of EBB with wedge dissassembled - simple design: screwing the bolt into the wedge part, slides the wedge up the bottom bracket clamping the EBB tightly to the frame:
    Need Help with Gary Fisher Rig Crankset and EBB bottom bracket removal-rig4.jpg

    Pic of EBB partially inserted (pic from drive side).
    Need Help with Gary Fisher Rig Crankset and EBB bottom bracket removal-rig1.jpg

  5. #5
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    looks like a Truvativ ISIS bottom bracket. sealed catridge, I don't think the bearings are really "serviceable".
    if the bearings are worn, throw it away and install a new Isis BB.

    note- Isis was a lousy design with tiny bearings that always wore out prematurely. if you want to get a better BB, you will need to replace the crankset.

  6. #6
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    Yep isis. I replaced my crankset to get outboard bearings (Shimano xt).

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