The NordicTrack Commercial S27i and Peloton Bike serve fundamentally different purposes—one is a treadmill for running/walking and the other an exercise bike for cycling—so direct comparison is limited. The S27i offers a 27-inch screen and 0-12 mph speeds (per NordicTrack specs) while the Peloton Bike provides magnetic resistance across 100 levels with a 22-inch display (per Peloton specs). Nei...