Horizon Fitness R51 Recumbent Bike Horizon Fitness Updated September 15, 2021 20:02 For the 2005 Horizon Fitness R51 Owner's Guide, please click here. For the 2005 Horizon Fitness R51 Exploded Diagram, please click here. Was this article helpful? Yes No 0 out of 0 found this helpful Have more questions? Submit a request Related articles Horizon Fitness R52HR Recumbent Bike Comments 0 comments Please sign in to leave a comment.