I have one of each......Dynatech in 2070 is a 54.5, Mtrax is a 55 (I think...it's at my son's house). Mtrax is a complete bike with RSX groupo 7-speed. Dynatech is frame only but may have some parts like Ultegra chainset etc if you need them and maybe wheels. Or of course I could swap the groupo from one to t'other if a complete bike is what you need. Where are you?? I can send pics of the Dynatech.
