In a message dated 2/22/04 11:05:45 PM Eastern Standard Time, email@example.com writes: axle intersects the imaginary line - Why? This is how I set them out of habit but, don't understand why. Does technical data say this is the best location? Not being nit picky, merely looking for the rationale behind habits, customs and wives' tales.
Why? When the wheelbase specification of a frameset is given, this is the place the measurement is taken from, a convention based on how a frame designer/builder planned it. If you think its a wives tale, then I can't help any further.