chain tensioner

thingiverse

Update 11Dec2019: I've put this through two cyclocross races and it performed exactly as I had hoped, staying intact throughout both events. Since then, I've added another 100 miles to its total mileage by commuting on it regularly, and it continues to perform flawlessly. I designed this chain tensioner to fit snugly over the chainstay, taking advantage of a cleverly crafted pulley found here: https://www.thingiverse.com/thing:2863096. To print successfully, you must include both support sides and utilize a skate bearing (608) for the pulley itself. The supports are carefully angled at 8 degrees to ensure optimal performance. Place it along the chainstay, aligning it perfectly with the front ring for seamless operation.