9/16 in

The Shimano PD5800 Flat/Platform Pedals are designed specifically for road bike-racing enthusiasts. These high-quality pedals, made from a combination of composite, aluminum, carbon fiber, and alloy materials, weigh only 0.62 lbs. and feature a sleek black color. With a 9/16 inch pedal axle size, these Shimano pedals are compatible with Shimano brand bikes and come as a set that includes both pedals. The flat/platform design offers a wide surface area for optimal control and stability while cycling.