The Cycleops JetFluid Pro redefines the standard for fluid-based indoor trainers. The Pro Series frame offers a much wider platform than previous Cyclops trainers. The resistance unit operates at cooler temperatures for quieter workouts, longer bearing life and a more consistent power curve. Each flywheel is individually balanced during manufacturing; this helps reduce noise and bearing wear while concentrating weight where it will most contribute to inertia so that a single missed pedal stroke won't slow you the equivalent of 5 mph.