Most of the pedals I have used have also had provision for using an allen wrench as well as an open-end wrench. That said, I've never run into a clearance problem where I actually needed a pedal wrench instead of a regular wrench. What makes a pedal wrench a pedal wrench is the thickness, not the size. A pedal wrench is thin to alleviate any clearance problems between the pedal cage or body and the crankarm.