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  1. #1
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    04 IH SGS-Pro Crank/BB upgrade

    My ride is a 2004 Ironhorse SGS-Pro.

    I want to upgrade my tired drive train.

    Does anyone know BB (width and spindle length) will work for this frame? Someone told me that the sizing was a little different and can limit my choices.

    Thanks

  2. #2
    Capricious youth...
    Reputation: Prettym1k3's Avatar
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    I think it's a 73/118 ISIS Gigapipe BB.

    I might be wrong, but I believe that's the BB that I ran on my 2004 SGS Pro.
    Meh.

  3. #3
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    if it's a 2004 SGS DH pro it has a 100mm BB shell and yes you are rather limited for choice. your options are either ISIS (Nasty), HTII (RaceFace?) or Profile 3pcs.
    each has a specific axle length to the application

  4. #4
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    100/145 good luck. They were a great idea, but way ahead of their time and the new standard seems to be the 83bb/150 hub combo. The SGS had a 165 hub. It couldn't even fit in the truing stand! Fahn

  5. #5
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    http://store.airbomb.com/ItemDesc.asp?IC=CR4925

    I have one on on my SGS and it's given me no problems after a season, still spins like butter.

  6. #6
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    Thanks everyone for the replies. Helps me source a new BB for the rig. Time for a winter breakdown and overhaul. Still a great frame for the age.

    And speaking of aged rigs, just picked up a 04 Demo 9 at a deal I could not pass up. Awesome condition. I'll be probing around for tips on that too.

    thanks again.

  7. #7
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    I ran a 100mm FSA bottom bracket with Middleburn cranks on mine and never had to touch them in 3 years.

  8. #8
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    really? every 100mm Platinum DH ISIS BB I ran developed play during the first ride.they span freely for years with the play gradually getting worse and worse - never actually failed as such.

    Nuckaman - you must like your meaty frames, the SGS is by far the heaviest frame I've ever had, and I think a demo9 is even heavier.

  9. #9
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    I still have the bb in the frame no plat at all. I've got a new frame now.

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