Treadmill Doctor Healthrider S900i Treadmill Running Belt Model# HRTL20010 Review HelpfulOwl Treadmill Belts June 29, 2018September 2, 2018Exercise & Fitness, Exercise Machine Parts & Accessories, Sports & Fitness, Sports & Outdoors, Treadmill Doctor 0 Comment This is the replacement walking belt for the Healthrider S900i Model HRTL20010 Walking Belt Size 19×124