The Elite Rivo smart trainer keeps a beginner's indoor setup simple. Included adapters fit quick-release and 12 x 142mm thru-axle frames, and a pre-installed freehub body takes Shimano and SRAM 9 to 11-speed cassettes, while Micro Spline, Campagnolo, and XD/XDR bodies are sold separately. Direct drive electromagnetic resistance follows the app automatically on this Zwift compatible trainer, up to an 18 percent grade. What Our Gearhead(R) Experts Are Saying:"I recommend the Rivo to first-timers short on space. The legs fold to 6. 3 inches deep, and the handle carries it from the bike to a closet in one trip."