Technical & Reference Section > Tech and Restoration

Fitting a Sealed BB

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madmaxusm:
Just one more quick question ???

Will this fit a 92 Robinson SST frame ok.

Many thanks in advance

SaMAlex:

--- Quote from: sonic-1 on February 14, 2008, 12:07 PM ---the ct crank set dont come with a spacer

--- End quote ---

Like the man said, those cranks dont use a spacer, they are designed to not need one. You lock the BB nuts up independantly of the crank arms, where as on Profiles, the arms also tighten up the BB so you just crank (haha) them up tight, hence needing the spacer

madmaxusm:
Thanks for the info, the only reason I asked about if the BB would fit the Robinson frame is that when I fiitted the cups earlier they seemed to go in very easy (like they were slightly too small).

Are there different sizes of BB cups or are they designed to fit all frames ?

Gary72:
I have Robinson pro and found that my OPC shells fell in, so dont know if it is a Robby thing, I'm looking to use 3 piece and if they are loose might go with the tin can shim method

SaMAlex:
There is/was only one size of USA BB, but there is no set standard for what the size is! It was a right nightmare, esp if you were trying to make a frame. If you got 10 brand new BB cups from different cranks they would all be slightly different sizes! If you make the frame BB large enough for the biggest cups, the smaller ones would be too loose! Same applies if you were trying to make BB cups.

Mid Vs Spanish is hard to pick ... but a BB size that actually has a set size to it is great!

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