The line drawn on the TT inticates where the tube's wall thickness changes. It is important to be aware of this change. We're using OX Platinum for the main tubes to keep things strong and light weight for Mark!
Last night I also added cantilever mounts to a local guys Surly Steam Roller. Pete wanted better braking for skids on the polo court. He picked up his bike this after noon with a huge smile on his face. I added he mounts, installed a Avid brake, and Pete bought some very crazy handle bars off me for his newly modified Steamroller.