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  1. #1
    Freddin' it
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    Tips for BB Replacement Procedure on a Carbon Fiber Frame?

    Getting close to installing a new 105 external BB to replace the FSA MegaExo BB on my carbon fiber Roubaix. What tips do you have? Do I need to dress the threads (frame or BB) with anything? I plan to remove and replace using an external cartridge wrench, but no torque wrench. Are the torque specs the same for the BB regardless of frame material? Thanks!

  2. #2
    Senior Member cracker7213's Avatar
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    Carbon fiber will require a specific torque that you should not over look. Remember Carbon fiber can crack easily. I would bring it to a shop, but if you have the knowledge and tools, i.e. a facing tool and torque wrench you should be fine. Just look up "how to face a BB on google. The only thing you need to do to the frame before the install is lubricate. Remember, never material on material. Always lubricate.

  3. #3
    Freddin' it
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    Thanks, *******. Why the facing tool? The current BB has been off and back on again in it's life. I was thinking the new one would just spin back on. What does facing do to an already in-use frame? (Not a challenge, I truly don't know.) And what lubricant? Bearing grease? Something specific to carbon? Thanks!

  4. #4
    coprolite fietsbob's Avatar
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    well the torque wrench and tools to put the external bearing assembly in are required
    then Know the torque specs , anti seize the cups thread, to make the removal go well the next time
    torque spec is different than a dry fit.
    and if all is aligned the axle tube should slide in both sides, with out binding.
    If it binds or doesn't go in easily the threads in the frame are not aligned.

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