Are these tubes a gimmick or do they work? Square tubes????
http://www.wheelbuilder.com/...protek-max-tube.html
http://www.youtube.com/watch?v=EaODtgHQE8Y
http://www.wheelbuilder.com/...protek-max-tube.html
http://www.youtube.com/watch?v=EaODtgHQE8Y