The Chaya G-Force Hard is a high-quality wheel built and designed with roller derby in mind at an affordable price. At the perfect size and hardness for roller derby (59mm,94A), this wheel will suit most floors and can also be used for smooth outdoor surfaces. The highlight of this wheel is the added urethane lip that ensures snappy lateral movement across the track as well as greater push in your strides. Chaya G-Force wheels are available in two hardness - 92A and 94A.