How to Replace the Rear Roller on a Treadmill. Horizon Fitness Updated April 21, 2022 21:08 Please see the attached PDF for instructions on how to replace the rear roller on your Horizon Treadmill. Click Here for a Video on Replacing the Rear Rollers For assistance, please call 888.878.9011 or email firstname.lastname@example.org. To order replacement parts, visit parts.horizonfitness.com or email email@example.com. Replacing Rear Rollers on a Treadmill.pdf20 KB Was this article helpful? Yes No 0 out of 0 found this helpful Have more questions? Submit a request Related articles How to Replace the Running Belt and Deck on a Treadmill. How to Replace the Motor Brush on a Treadmill When to Replace a Treadmill Belt Running Belt Adjustments How to Fix a Loose Treadmill Running Belt Comments 0 comments Article is closed for comments.