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  1. #1
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    Lightweight isis bb?

    I'm looking to replace my isis bb. Are there any lightweight offerings available? On my initial search, I didn't come up with much. I'm looking for a 73x113. Any suggestions would be appreciated!

  2. #2
    Hardtail Steel Forever
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    KCNC makes a fairly light 73/68 one. Many of the ones marketed for ultra light are 68mm only.
    Personally, I would find the one that lasts the longest unless you are really pinching for g's. I would guess best case you're looking at about 50g - 75g of savings, but you could easily be spending $100 extra for it.
    WTB: Med Bontrager Ti Lite, PM Me...

  3. #3
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    Crank brothers made pretty nice one, you would have to grab one from ebay though.
    https://www.ebay.com/itm/Crank-Broth...wAAOSwLe5axafs
    Looking for a Medium Scott Scale frame, preferably a 2012 in 26.

  4. #4
    Flappity flappity flap
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    Quote Originally Posted by jestep View Post
    KCNC makes a fairly light 73/68 one. Many of the ones marketed for ultra light are 68mm only.
    Personally, I would find the one that lasts the longest unless you are really pinching for g's. I would guess best case you're looking at about 50g - 75g of savings, but you could easily be spending $100 extra for it.
    Uh huh.

    You'll replace them more often than pretty much any other BB anyway, they don't hold up super well due to the oversized spindle and undersized bearings.

    I believe they are 22% stiffer* than a square taper though, so that's cool.


    *See how I wrote 'believe'? That's cause it's made up.

  5. #5
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    FSA made ti models in that size, still have one in the parts bin. Make sure it comes with the crank bolts if you buy one, takes M14 bolts that pretty much only FSA ever used.

  6. #6
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    The Stronglight Twister and Crank Bros versions both had doubled-up bearings to help with the design flaw. I've been running the former in an SS conversion for years now without issue, but rides are usually dry. No idea if either are still available, but if you can find one, I recommend.

  7. #7
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    IIRC the Truvativ DH BBs have four bearings as well.

    Got a couple of play-free years out of one of those.

  8. #8
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    +1 for the Truvativ.

    I just recently installed another Truvativ BB. Specifically, I picked up Truvativ's Giga Pipe Team DH Isis BB from Jenson for $42. Supports 68/73mm. Weighs 344g. As mentioned by others, has 4 bearings. This will be my second time getting this same BB. The first one lasted years. Prior BB's of varying brands barely lasted a year each, some just a few months.

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