This pedal is equipped on one side with a SPD-compatible cleat system, the other side has got a normal "bear's paw" tread. Thus you have got the possibility of biking wearing "normal shoes" or of optimising your treading energy and the roundness of your treading with the help of a system shoe. The pedal body, as well as the footholder are made of aluminium, the CroMo axle has got ball bearings. The SPD adapter is contained in the scope of delivery and is compatible with all current bike shoes.