Conquer Indoor Bicycle Cycling Parabolic Roller Trainer Parabolic rollers enhance stability and are safer than straight rollers Sealed bearings for smooth rolling Compatible with 27 in. and 700c bikes Step allows for easy mount and dismount Sealed bearings mean smooth rolling Wide step allows for easy mount and dismount Parabolic rollers enhance stability Close to &#034;on-road&#034; experience Compatible with 27 in. and 700c bikes You can work out at home, on YOUR bike. Stay dry, warm and weatherproof! There is no traffic, and no smelly vehicle fumes. Train for stamina, cadence, form and endurance. Develop core strength. Watch TVor stream a movie; catch up on podcasts while you ride. Bike trainers are portable. Put one anywhere in the house, garage, or on porch. Easy to take on vacation or work travel.