Treadmill Doctor Belt for Fitness Gear 811T Review HelpfulOwl Treadmill Belts May 4, 2018September 2, 2018Exercise & Fitness, Exercise Machine Parts & Accessories, Sports & Fitness, Sports & Outdoors, Treadmill Doctor 0 Comment This fits your . Make sure this fits by entering your model number. Lifetime Warranty This is The Replacement Walking Belt for The Fitness Gear 811T