Pacer GTX 500 Mach 5 Quad Speed Skates - Black The GTX 500 Mach 5 skate features a comfortable man-made boot on a light weight and strong Zytel plate with double action trucks. Pacer 62mm Mach 5 wheels and fixed toe stops. Bevo ABEC-1 precision bearings. These skates are a very good value for the price. They are the only speed skates that we are aware of with such good components at under $60. Sizing: Boys and men - true to size. Ladies and girls - order one size down.