Product Name: Footrest Extension Extender Material: Chrome-molybdenum steel Dimensions: 32*18mm Weight: 50g/pair Shaft specification: 9/16" (14mm) Extended footrest center distance: 20mm Specifications: L is left, R is right The product is divided into left and right shafts as a pair (shaft teeth on the same side can be stacked). Tightening method: use a No. 15 open-end wrench Advantages: 1. Protects the crank from damage when changing pedals 2. Extending the shaft core applies the lever principle for greater efficiency 3. If your feet are relatively large, it may cause friction between the shoes and the crank, which can also be resolved