Horizon Fitness B51 Upright Bike Horizon Fitness Updated September 15, 2021 22:04 For the 2005 Horizon Fitness B51 Owner's Guide, please click here. For the 2005 Horizon Fitness B51 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.