Bikers initiate a shift by rotating a switch on the handlebars. That signals two motors, one on the frame-mounted shock and one on the fork, to turn oil-regulating valves, which restrict or free internal pistons. The system is just five ounces heavier than a manual one, so there’s not a lot of extra heft to lug uphill. Fox will debut iCTD on mountain bikes from Yeti, Scott, and others next year. Riders can also retrofit it onto almost any model, so no one has to get roughed up—or lose steam—on the trail again.