Treadmill Doctor Trimline 1600.1 Treadmill Running Belt Review HelpfulOwl Treadmill Belts May 21, 2018September 2, 2018Exercise & Fitness, Exercise Machine Parts & Accessories, Sports & Fitness, Sports & Outdoors, Treadmill Doctor 0 Comment This is the replacement walking belt for the Trimline 1600.1 Model Walking Belt Size