9/16 in

These lightweight, aerodynamic single-entry SPD road pedals are suitable for touring as well as urban riding. "Used" Shimano Tiagra Clipless Pedals PD-A520 "Cleats not included" Product Description:Lightweight, aerodynamic single-entry SPD design Recessed SPD shoe compatible allows off the bike walking Customize the entry and release tension settings The legacy of SHIMANO design, quality and performance Product Specifications: Best Use: Road Cycling Pedal Axle Size: 9/16" Pedal Design: Clipless Series: TIAGRA 4700 Series Cleat Design: 2 Hole SPD Compatible: Yes Color: Silver Material(s): Aluminum Weight: 315 grams Please ask any questions you might have before purchasing an item. If you would like to return an item, please send a message before initiating the return. There could always be a way to resolve the concern before returning the item. We strive for buyer satisfaction! Item will be shipped via USPS/UPS with an expected delivery of 2-5 business days once shipped. Thank you from American Bike Pickers.