The Cateye CS-1000 lets you set your mag resistance level as you're riding, simulating a hill climb up to 10% through eight steps. Use this in combination with the turbo fan, for realistis "road feel," or without, to keep the noise down. Integrated cycle computer track your current speed, distance, exercise time, load (% grade), power (watts) and energy (calories). Solid front fork/rear wheel mount fits road and mountain bikes. Folds for storage