What does 4up and 4out etc mean when it comes to bike building?
Answers:
It doesn't refer to the rake in the frame. It refers to how far up and out the frame tubing has been extended (at the neck) in inches by the builder in order to make the bike longer and taller. You can also "extend" the frame "under" by cutting out tubing and rewelding the neck in place in order to give the bike a more snub nosed profile.
the rake and stretch of the frame.
More commonly referred to the 'rake'. Four (4) inch on the backbone and four (4) to the neck. 'Back in the day' as you younger guys say, we just cut the neck loose and increase the angle to accommodate the front end we were going to install (ie. Springer, Girder) and compensate for the length (ie. 8", 10", 12"
or the radical 18" overstock) which could be up to 21". If the scoot chopped right, it not only looked funny, being that the down-tubes were 12" from the ground at the front half and 4-6" at the tail..and yes they were rigid, NO springs. That's what is called a Hard-Tail.
Hope that answers your question.
"4-up" means 4 inches have been added in the downtubes (the one or two tubes running from the steering head down in front of the engine).
"4-out" means 4 inches have been added to the backbone(the tube running from the steering head, under the gas tank, back to the seat area on swingarm/softtails-rear axle on hardtails).
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