- ( Always keep in mind that mathematics and geometry are great tools but please don't get so embedded with technical perfection that you loose track of what building a Chopper is all about. This craft is largely a means of artistic expression and as such you will often find yourself pushing the envelope far past what the 'experts' have to say about almost everything with respect to motorcycle engineering. Nothing is chiseled in concrete when it comes to building bikes of any kind. You cannot build Choppers from 'textbook' formulas or equations and even the stuff we publish here is just 'guideline' type material.)
