you are better of using a DOM (Drawen over hot mantel) tubing you can use the most comon size of 0.20 or a little heavier 0.25 these are the most common sizes. DOM steel tubing is the most versatile for welding on.
Jul 11, 2008 Rating
Answers: by: Support
There is some very good information on this page:
http://www.custom-choppers-guide.com/bike-building-questions.html
You should get plans from Rick Hedrick because he provides good support on your project via email, fax, and even on the phone:
http://www.custom-choppers-guide.com/chopper-frame-plans.html