This trainer and riser ring are in great condition and the trainer runs as smoothly and quietly as advertised new. It doesn't take up a lot of space; it folds up compactly for storing. Resistance adjusts automatically as you shift gears from 5-3,000 watts. Additional information can be found currently on the REI website (or google) for the product. I bought it a little over a year ago when I was racing, but I no longer need the trainer for practice in my home and it sadly sits tucked away. I originally purchased the trainer for $329.99 ($50.00 off suggested retail) and bought the riser ring separately for $25.00. Thank you for looking! $225.00 obo.