A heavy and wide roller with high-precision machined steel covers attached. Can be used for smooth and high-speed rotation practice over other smaller diameter rollers. Professional rider features such as matched wheelbase adjustability with continuous adjustment by scale on the frame of the rollers. Uses a high-rigidity and lightweight aluminum frame. Exclusive front drop roller adjusts the middle roller to provide an even safe spin at high RPM`s. Include 6 points height adjustable feet and footrest. Fits 26 to 700C bicycle which wheelbase is between 950 - 1080 mm