The most versatile trainer you can find, featuring two separate flywheel options: an attached 6 lb. flywheel designed for interval training, plus an additional 12 lb. flywheel (18 lbs. total) for hard-core endurance workouts, like tempo and Long Slow Distance rides. Plus, the incredibly stable 540 square inch base keep each pedal stroke stable and focused. Variety has never felt more road-like.

Product Link:
http://www.kurtkinetic.com/pro-trainer-p-106-l-en.html