Originally Posted by verktyg

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2. These are/were BICYCLE parts not Swiss watch movements! The manufacturing tolerances in the tapered square mounting holes in the crank arms plus the small end measurements and lengths of the tapers combined with the overall spindle lengths vary substantially within the same make and part number! I've known this for many years but never documented it.


I measured all of these BB spindles and cartridges in this box plus a lot more. They were various Campy, Ofmega, Avocet, Shimano, Suntour, SR, Sugino, TA, Stronglight, Phil Wood and other brands.


3. If it fits, it works! These views show the proper crankarm fit on the BB spindle taper




4. Fitting the spindle to the BB cups presents some additional issues. The balls should run in the center "ball track" - not too high or too low. The second picture shows the proper ball contact area.



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