Originally Posted by
Lenton58
What would the axle have to do with anything, as many drop-outs are horizontal and the axle can be moved around according to adjustment. The diagram here should help you. The point that
this builder uses is the apex of the end of the dropout. This should IMHO work the same for vertical d.o.'s as well as track ends. You may get other opinions.
And that's the problem---other opinions. You hear that 'x bike has chain stays of'....but measured from where to where? Looks like the middle of the BB is a good starting point, and the apex of the dropout makes sense. Of course, that's about the middle of the axle.