G'Day guys it is Dan the man here from Australia, I have just joined CC and i have a question for the Martin Bros crew. I am trying to design my own chopper on computer only and i was wondering about the term stretch. I know what stretch is but i do not know what is based on, if someone says they want a frame to have 3" of forword stretch, is there an industry standard to which these measurments are taken from, or are they specific to each individual frame builder.
Well, I'm not from the Martin Bros. crew, but I can answer your question. The dimensions are based on a stock HD frame. There's a good explanation here: