Horizon Fitness T51 Treadmill Horizon Fitness Updated September 15, 2021 22:33 For the 2005 Horizon Fitness T51 Owner's Guide, please click here. For the French Owner's Manual, please click here. For the 2005 Horizon Fitness T51 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.