Written by coream at 9/04/2008 09:12:00 PM Delta 7's Arantix bike frame is see-through and weighs just 2.75lbs but is so strong there's no rider weight limit. It's made of Isotruss, a material consisting of carbon fiber strands bent into a wide mesh to emulate the sturdy geometry of steel truss structures. That tech ain't cheap: Expect to pay $7,000(frame only—the other parts will run you $4K more). Hurry, there's going to be only 200 made...