Treadmill Doctor Lifestyler Expanse 550 Treadmill Running Belt Model 297151 Review HelpfulOwl Treadmill Belts May 5, 2018September 2, 2018Exercise & Fitness, Exercise Machine Parts & Accessories, Sports & Fitness, Sports & Outdoors, Treadmill Doctor 0 Comment This is a replacement walking belt for the Lifestyler Expanse 550 Treadmill Running Belt Model 297151