Horizon Fitness B20 Upright Bike Izzie K Updated September 15, 2021 18:20 For the 2004 Horizon Fitness B20 Owner's Guide, please click here. For the 2004 Horizon Fitness B20 Exploded Diagram, please click here. Was this article helpful? Yes No 0 out of 0 found this helpful Have more questions? Submit a request Comments 0 comments Please sign in to leave a comment.