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  1. #1
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    Replacing Crankset

    I have a Bontrager crankset that I want to replace. All my other components are campy. I realize I will need replace my bottom bracket to match my crankset. I current have a triple crank set, if I purchase a campy crank with similar gears, will that work with my existing components, or is there some other measurement/size that I need to consider? Also how do I determine the size of my bottom bracket so I can replace that also?

  2. #2
    cab horn
    Join Date
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    1987 Bianchi Campione
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    All you need to know is the exact campy triple you plan on purchasing. The BB will be spec'ed for that crankset and then you go buy that. Install and done.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  3. #3
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    Thanks for the info, I wasn't sure how interchangeable cranskest & bottom brackets are.

  4. #4
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    i think all of the new campy BB's are 68/73 so just get whatever BB goes with the crank you want. Just make sure you dont get a bigger big ring or else you will probably need a new chain. Also you may need to shorten the chain if you get a smaller little ring, and i know that the campy connecting links arent super cheap.

  5. #5
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    Quote Originally Posted by the sasquach View Post
    i think all of the new campy BB's are 68/73 so just get whatever BB goes with the crank you want.
    What's 68/72?

  6. #6
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    68/73 refers to your bottom bracket shell width (the width between the cups). Internal cartridge bearing BB's are usually designed for either a 68mm or 73mm bottom bracket width, but most of the new external bearing BB's come with spacers to use on the smaller 68mm shells
    Professional mechanic for 9 years

  7. #7
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    My BB cup is 68mm and the existing BB says BSA, so I need English threads. I see BB come in 2 spindle lengths 111mm & 115mm. I assume the 111mm is for double cranks and the 115mm is fro triple cranks. Excuse me if I stating the obvious, I just don't want to purchase the wrong parts

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