Review: Ride Concepts Powerline Flat Pedal Shoes - Pinkbike。Ride Concepts Powerline Flat Pedal bike shoes size US 11.5 EU 45 UK 10.5 See Photos ( pictures of imperfections) In Good condition Ride Concepts worked with Rubber Kinetics to come up with the compound used for the sole of the Powerline, and the result is called DST 4.0 Max Grip. It\'s a soft, 40a rubber, which, as the name implies, was designed to provide the high level of traction required for rough descents. The tread pattern consists of dozens of raised hexagons that are spaced out to provide room for pedal pins. Other details include an elasticized lace holder, a molded rubber toe cap, and a gusseted tongue that helps keep trail debris from sneaking into the shoes. MSRP: $150 USD.