Because they are human powered and not motorized. I think you'll find that I'm fairly consistent in my definition on non-motorized vs motorized. MTB: Non-motor

Because they are human powered and not motorized. I think you'll find that I'm fairly consistent in my definition on non-motorized vs motorized. MTB: Non-motorized Dirt Bike/E-Bike/One Wheel/Jeep: Motorized