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 Does the Diamondback Fitness 1260sc Connect to the Peloton App? Is There a Way to Calibrate the Diamondback Fitness 1260sc Console? Which state will my order ship from? How can I order parts for my machine? Comments 0 comments Please sign in to leave a comment.