Originally Posted by
AnthonyG
700c is ISO (or metric I suppose) 622 mm BSD (bead seat diameter)
All rim dimensions for everything from aeroplanes to wheelbarrows are set by E.T.R.T.O. ISO has nothing to do with it.
622 is a figure that is
calculated and not actually measured, according to the procedures and using the specific tools described, in detail, within the E.T.R.T.O. book. I have the latest edition sitting on a shelf next to my desk. It is a mind numbing read but something I need to be very familiar with in my work.
Again, for those who haven't picked up on this the first 20 times I mentioned it, ISO has nothing to do with setting these standards.
I know there are old rims with ISO written on them and I know ISO is listed on Sheldon's site but trust me, it's E.T.R.T.O. all the way.