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Confusingly specialised us the OSBB term to name pretty much all of their bb's
But it is 68mm wide.All of this has reminded me that I had to use a non standard spacer set up on my caad10 to get a good chainline and for the arm to sufficiently clear the etap front mech. I imagine this ball ache will happen on the new frame...
Just looked at my arms, I think you're right. Dont see any of bonding lines that can be seen on the sisl canks
IS OSBB 68mm wide? If so install them in the same way they'd go in to a CAAD10, which is basically a large 5mm hat looking spacer on the NDS assuming you have the 109mm axle.