The Aireon Mag-33 is the best trainer value available anywhere! High quality tubular steel frame is rugged & sturdy, and the quiet & reliable 3-level magnetic resistance unit spins on precision sealed bearings for flawless, smooth performance, electronically counterbalanced by a precision 2-lb flywheel.
Combined with the gears on your bike, the 3 levels of magnetic resistance offer more than enough variablity to allow customized workouts, from high-rpm spin sessions to hard, low-revolution hill simulations. Fits almost all bikes - 700c road or 26" MTB. Does not fit 650c wheels. Folds flat for easy storage.