What is the Weight and Dimensions of the Flywheel on the Diamondback Fitness 1260ub ? Dan October 01, 2020 22:24 Follow The Diameter of the Flywheel in the 1260ub Upright Bike is 265mm and it weighs 22lbs. Click to learn more about the Diamondback Fitness 1260ub Upright Bike! Related articles How can I order parts for my machine? Comments 0 comments Please sign in to leave a comment.