Calling all ISIS BB users.- Mtbr.com
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  1. #1
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    Calling all ISIS BB users.

    Hi,

    I'm on my way to first fat bike build and had some ideas about this and that.

    However not sure about BB selection.

    Want to use Middleburn ISIS drive crank and got Truvativ Giga Pipe or FSA DH Platinum option only.

    Went into details and found out that Truvativ is claiming 4 bearings, whilst FSA only 3. Had both standard Truvativ and FSA ISIS BBs on standard bikes, no problems whatsoever, but 100mm BB shell might (?) pose special requirements and conditions.

    So to cut story short: FSA or Truvativ?

    All input much appreciated...

    Cheers!
    I.
    LoMF syndrome...

  2. #2
    try anything on a bike
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    Calling all ISIS BB users.

    I have an FSA isis bb. Probably 1000 miles on it with zero issues. Still smooth and quiet. Mine is paired to the FSA Alpha crank
    The most freeride like fat bike I could make with available parts...

  3. #3
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    I have both, and have used both a lot! I haven't found one to be better then the other really, but I tend to lean more to the Truvativ, out of the box it's much smoother then the FSA (Although the FSA does smooth out over time). I would say the bearing sealing is a bit better on the Truvativ also. But again I have had no issues with either unit, and I have had both completely submerged in water on some rides. Oh the FSA does have more side to side adjustment, incase you need to put two drive side spaces behind the drive side BB cup.

  4. #4
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    Cheers Chaps!

    Looks like it would be down to which one I'll be able to get cheaper

    Cheers!
    I.
    LoMF syndrome...

  5. #5
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    I have a ton of miles on my FSA ISIS BB. Still rolling smoothly after 3 years.

    When I first bought it I remember doing some digging and at the time the Truvativ seemed to have a bad rap for failing. The shops I contacted recommend the FSA. I'd second that recommendation.

  6. #6
    Elitest thrill junkie
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    GxP "ISIS" BBs are not the same as the old terrible BBs from 8 years ago, the external bearings on the GxP make the old bearing issues non existent.
    "It's only when you stand over it, you know, when you physically stand over the bike, that then you say 'hey, I don't have much stand over height', you know"-T. Ellsworth

    You're turning black metallic.

  7. #7
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    No, no, no and once agian no... No external bearings. Only internal

    Bad, bad experience with externals. Back do good 'ole square, Octa or ISIS.

    Happy as Larry since then...

    Cheers!
    I.
    LoMF syndrome...

  8. #8
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    Unless your frame is perfectly faced, use the FSA. The 4 bearings in the Truvativ are for impact load on DH bikes and (due to how the Truvativ is assembled) become mis-aligned in anything but perfect frames, thus causing premature failure. You can modify the Truvativs to only have 2 bearings which makes them last longer than the FSAs with the benefit of being able to replace each bearing with Enduros for ~US$9 a piece...

  9. #9
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    Good point Sir.

    Still it would be down to lower costs me think...

    Cheers!
    I.
    LoMF syndrome...

  10. #10
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    It's your money! Just speaking from my experience (~600mi/Truvativ 3x before I decided to switch; ~2500mi/FSA; 11,000mi and going without replacing the bearings, yet/Truvativ converted).

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