Bottom Bracket spindle length confusion...
#1
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Bottom Bracket spindle length confusion...
Hello all,
I am out of my league when it comes to understanding all the measurements on bottom brackets. Here is what I am trying to do, I would like to replace the BB on an old vitus frame I picked up, before you ask it is English thread. I want to set this bike up with a 9 speed campy record group. From what I gather, the record BB is a 68 x 102, however the original BB is 68 x 120. It had an old stronglite crank on it.
Seems like longer spindles these days are intended for triple cranks, the orginal stronglite crank on this bike is just a standard 2 ring. Is the spindle length a factor of frame line up, or derailer reach? Or is it simply a factor of the crank you are using? I.E. I am using a campy 9 speed crank so therefore use the corresponding BB? If I use the old stronglite crank then it requires a 120mm spindle...etc. it needs the stronglite BB to install correctly.
I should add that the reason I wish to use a campy BB is mainly the weight. The orginal stronglite BB is quite heavy, but it is in good serviceable condition... The crank is kind of beat up though. I am also guessing that I could not fit the campy crank on the original 120mm spindle..
This old frame is amazingly light and I was hoping to do it some justice with some campy parts..
Any reply is appreciated..
J
I am out of my league when it comes to understanding all the measurements on bottom brackets. Here is what I am trying to do, I would like to replace the BB on an old vitus frame I picked up, before you ask it is English thread. I want to set this bike up with a 9 speed campy record group. From what I gather, the record BB is a 68 x 102, however the original BB is 68 x 120. It had an old stronglite crank on it.
Seems like longer spindles these days are intended for triple cranks, the orginal stronglite crank on this bike is just a standard 2 ring. Is the spindle length a factor of frame line up, or derailer reach? Or is it simply a factor of the crank you are using? I.E. I am using a campy 9 speed crank so therefore use the corresponding BB? If I use the old stronglite crank then it requires a 120mm spindle...etc. it needs the stronglite BB to install correctly.
I should add that the reason I wish to use a campy BB is mainly the weight. The orginal stronglite BB is quite heavy, but it is in good serviceable condition... The crank is kind of beat up though. I am also guessing that I could not fit the campy crank on the original 120mm spindle..
This old frame is amazingly light and I was hoping to do it some justice with some campy parts..
Any reply is appreciated..
J
#2
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Is the spindle length a factor of frame line up, or derailer reach? Or is it simply a factor of the crank you are using? I.E. I am using a campy 9 speed crank so therefore use the corresponding BB? If I use the old stronglite crank then it requires a 120mm spindle...etc. it needs the stronglite BB to install correctly.
#3
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Older cranks used longer, asymmetrical spindles; that's what accounts for the length difference you note. So, you'll want to use the Campy spindle for your Campy crank.
#4
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Thank you very. Ugh for the information, appreciate it!
j
j
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Got it! Thank you very much for the info!
j
j
#6
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The recent Campagnolo Cranksets , like maybe yours, certainly mine. the right crank arms are different, the triple and the double.
so they share the same spindle I have a 'Race Triple' it comes into meet a 111 symetrical BB cartridge type ..
the older type the arms were the same , then the spindle, asymmetric , was where the different chain lines were sorted out.
so they share the same spindle I have a 'Race Triple' it comes into meet a 111 symetrical BB cartridge type ..
the older type the arms were the same , then the spindle, asymmetric , was where the different chain lines were sorted out.