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Thread: What BB to get?

  1. #1
    spin The LT's Avatar
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    What BB to get?

    Hi, I'm kinda new to the MTB section of Bikeforums(typically over in SS/FG) I've posted a few times but figured I would say hi before I started asking a bunch of questions. What I want to know is what bottom bracket to get for my azonic steelhead that I am building up. I am running a truvativ crank(isoflow i think) with a bash guard on the outside(using the 32 middle ring) and a surly SS rear wheel with a shimano freewheel.

    I had a 113mm BB installed but when I put the chain on it was rubbing the bashguard and making a bunch of noise. I figure I have to get a longer BB and I was wondering if a 115mm BB will push the drive side out 1mm, 2mm, or 0mm. The crank is square taper so I will be using a Shimano UN series BB and I know some of the lengths are asymmetric so I want to get some more opinions/answers before I spend the money to buy a new BB

    Thanks in advance

  2. #2
    Senior Member FreeRidin''s Avatar
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    If you switch from a 113mm to a 115mm spindle you will move the drive side crank out 1mm.

    Why don't you run a spacer on the right side of the BB?
    Quote Originally Posted by Killer B
    The way I ride requires the most advanced, toughest wheelset's available.

    Chicago Freeride

  3. #3
    spin The LT's Avatar
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    ok so the 115mm BBs are symmetrical. good to know.....I already have a spacer there and it isn't enough but a 115mm with a spacer should do the trick i think

  4. #4
    Senior Member metabike's Avatar
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    I know that ISIS BB's are symmetric but I am not sure about square taper cartridges. Better check out Sheldon Brown's website & BB sizing chart before you buy.

  5. #5
    Te mortuo heres tibi sim? scrublover's Avatar
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    Assuming your chainline is decent the way it is now, no need to mess with a new BB, and still have issues.

    Get a few chainring bolt spacers (yes, such do exist) and space the bash guard out a little more. Should quiet things down, and unless you get too crazy with it, shouldn't cause any issues at all.

    Plus, it's cheap and easy.
    I believe the clouds in my coffee more than the weatherman on t.v.

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