Horizon Fitness RT1 Treadmill Horizon Fitness Updated September 14, 2021 21:50 For the 2004 Horizon Fitness RT1 Owner's Guide, please click here. For the 2004 Horizon Fitness RT1 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 What are normal treadmill noises? Comments 0 comments Please sign in to leave a comment.