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Old 04-04-07, 08:58 PM   #1
The LT
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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
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Old 04-04-07, 09:35 PM   #2
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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?
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Old 04-04-07, 09:45 PM   #3
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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
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Old 04-05-07, 05:26 AM   #4
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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.
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Old 04-05-07, 06:05 AM   #5
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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.
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