How do I change my one-piece cranks to three-piece cranks on my BMX bike?

February 8, 2010 by admin · 1 Comment
Filed under: Cycling 
bmx
buellxb9r_d-man98 asked:

I have a Diamondback Viper with a large bottom bracket, a one-piece 165mm crank and a 45 tooth sprocket. I would like to change it to a lighter, smaller sprocket. What do I have to change? Also, what is an ISIS bottom bracket??? Should I keep the same length cranks and same tooth sparocket? I’m guessing I will need to switch chains as well. Please help, Thanks!!!

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Comments

One Response to “How do I change my one-piece cranks to three-piece cranks on my BMX bike?”
  1. Sam says:
    February 9, 2010 at 3:14 pm

    If you want to go from 1 to 3 peice cranks…first you need to take the bearings and cups out of your frame(cups-what the bearings are in). Then you need to get yourself a new set of bearings that will fit in your bottom bracket(yours are prob american).Your sprocket will not work with a 3 peice cranks unless you get an hat adapter to go on the inside of your sprocket. An isis bb is another name for a euro bb I think…either way you need American bb bearings. If you go from a big sprocket to a small one you can cut the chain down to the right linkege that you need. Hope this helps you out bro! Have fun

    -Sam Sam

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