The solution they reached was to replace the rear window with a large piece of carbon fiber molded to hold two bikes and two spare wheels, more than enough spare gear to support any rider in a time trial. As with the larger racks, the bikes were fixed in place with quick release clamps. But continuing on the car’s theme, they were also made from carbon fiber, rather than steel.
The result, Mr. Nevinson said, was a net weight reduction for the car, because the carbon fiber weighed less than the glass it replaced. It was also, unfortunately, totally opaque. So a video system was installed, with a monitor mounted on the windshield.