This summer in London, Trek will debut the lightest mountain-bike frame ever built. The Superfly SL Pro weighs just 31.7 ounces—two less than the lightest 29-inch frame currently on the market. To make the ride stiff enough to handle the Hadleigh Farm mountain-bike course, designers settled on carbon, which Trek product manager John Riley says is “the easiest material to work with.” Then they set about eliminating every possible ounce. The Superfly will be used by Canadian Emily Batty and American Sam Schultz and will go on sale to the public following the Games.
1. BRAKE POSITION
Instead of mounting the rear brake caliper on the seatstay, Trek positioned it between the seat and chainstay, allowing for a stiffer structure.
Because the frame is so stiff, excess material could be trimmed from the seatpost, cutting down on weight.
3. REAR DROPOUTS
Most hardtails have open dropouts. Trek closed them up—a lever locks the rear wheel in place—boosting stiffness by 30 percent for further weight savings.
Men's mountain bike: August 12, 7:30 a.m. EDT