The Shimano S-PHYRE RC910 road cycling shoe carries a carbon hollow core sole that sits closer to the pedal axle than any Shimano road shoe before it, putting more of each pedal stroke directly into forward motion. This build uses the DYNALAST 2. 0 wide last, giving a foot that spreads out under load real room instead of forcing a tighter dial pull to compensate. Dual BOA Li2F dials with textile laces still close down evenly across the wider volume, and a reinforced carbon heel structure keeps the foot from twisting loose during a hard sprint. What Our Gearhead(R) Experts Are Saying:"My foot spreads out wide once I'm out of the saddle, and the wide RC910 is the first flagship shoe where I'm not fighting the upper just to get full power down."