According to the bike experts, rollers have three rotating drums nestled inside a frame. The front and middle drums are connected by tubing or a belt, and the rear roller spins independently so you can easily adjust the spacing between the front and rear rollers to suit the size of your bike. To get started, all you need is an adjustable wrench. Set the rollers on a flat floor and ensure the cable is resting in the grooves on the sides of the roller drums as this cable is critical for connecting the drums so they rotate together. The next step is to check that your bike fits in the roller. Adjust the front drum position to fit your bicycle’s wheelbase. Using the adjustable wrench, shift the drum forward or backward so that the front wheel hub is slightly behind the drum. Once the rollers have been adjusted to the correct size, check that everything is tightened. Then, it’s time to start pedaling.