C-21x features a large 16 kg / 35 lb rear-drive flywheel, designed to simulate the feeling of an outdoor bike by storing kinetic energy and maintaining momentum for a smooth cycling motion and consistent cadence. No need for a power adapter, tangled wires or restrictive plug sockets, you have the power and freedom to train anywhere in your home. The fully adjustable handlebar setup with armrests, horizontal and vertical saddle adjustment, streamlined sprint saddle and Jendel spin pedals make the C-21x ideal for both sprints and long, flat endurance sessions.