Hands On Bike: Shimano Dual-Sided SPD/Flat Pedals: PD-A530 vs PD-EH500
Amazon.com: Thinvik Road Bike Clipless Pedal Convert to Flat Pedals,Universal Platform Pedal Adapters for Shimano SPD-SL System Pedal(Only Work on Shimano Road Bike Pedals) : Everything Else
Amazon.com : Mountain Bike Pedals - Dual Function Flat and SPD Pedal - 3 Sealed Bearing Platform Pedals SPD Compatible, Bicycle Pedals for BMX Spin Exercise Peloton Trekking Bike : Sports & Outdoors
Amazon.com : SHIMANO Clipless Pedals SPD Pedal E-PDM324 : Bike Pedals : Sports & Outdoors