Viewing 8 posts - 1 through 8 (of 8 total)
  • Fitting a Gigapipe bottom bracket – help!
  • agentdagnamit
    Free Member

    Hi

    I've just removed and regreased a creaking Gigapipe bottom bracket on a Cannondale Prophet. But it doesnt look right now that I've reinstalled it, and the fact the the chain wont shift onto the big ring suggests it isnt seated back in place properly.

    There seems to be too big a space between the bearing outer cup and the crank arm. Trouble is, I dont remember exactly what it looked like and how it was seated before I removed it.

    Should the drive end of the crank arm be completely flush with the bearings in the shell, or should there be about a 3mm gap?

    cheers

    theotherjonv
    Full Member

    Never done a Truvativ so no direct experience, but extrapolating from RF and Shimano, and considering that the shifting is fecked, I'd suggest that no, it isn't right.

    From link:

    http://www.sram.com/_media/techdocs/2005_gxp-05-r5-e.pdf

    have you tightened the other crank arm fully – if so i can't see why you'd have a gap? Theaxle should pull through as the bolt tightens the non-drive arm up against the bearing

    UNLESS – idea just came to me – did you remove and reinstall the BB? In which case, have you missed the BB bearing cup spacers out (as 2 of those = 3mm)

    owenfackrell
    Free Member

    Thw crank arm on the drive side on my road one has a gap but the non drive side sits flush. As above have you missed a spacer?

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    agentdagnamit
    Free Member

    Yeah, that's what I'm thinking now. Pretty sure there was only 1 spacer when I removed the BB and Cranks, but I reckon there should be 2 (or none). SRAM site is currently down.

    2 spacers would make it all snug, I'll check again.

    I have just read some posting about having to take a mallet to the drive side to get everything tight, hopefully that wont be necessary….

    agentdagnamit
    Free Member

    I reckon a 68mm E type bottom bracket needs a spacer on each side, will check with Truvativ / SRAM tomorrow

    I think Evans mucked up

    cheers

    theotherjonv
    Full Member

    sorry, realised an error in my post. 2 spacers aren't 3mm, they would make 5mm; each is 2.5mm so might still be the answer.

    However – 2 spacers would be unusual. Normal would be

    Non drive crank-cup-[BB shell]-spacer-cup-drive crank if your shell is 73mm

    or

    Non drive crank-cup-spacer-[BB shell]-spacer-spacer-cup-drive crank for a 68mm.

    Only mod being if you have an e-type BB it replaces one of the spacers on the drive side.

    theotherjonv
    Full Member

    Just saw your post – that would be it.

    One spacer each side and your e-type and it should all snug up.

    agentdagnamit
    Free Member

    thanks as usual guys

Viewing 8 posts - 1 through 8 (of 8 total)

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