I have been designing (not building unfortunately) my own bikes for a while now and have been stumped by something recentley. I have always thought that the rear travel measurement is the total displacement of the axle. In other words, the straight line distance from the rest position to the bottom out position. However, I have also heard that rear travel is measured by the total "vertical" distance that the axle travels. This might seem kinda trivial, but with high-pivot bikes, I have found up to a 7mm difference between the two measurements. Is one method more correct than the other in the mountain biking industry?