Overview of quick-release systems

On some bicycles, a quick-release system holds the wheels on the fork or frame. This system generally consists of a lever, a skewer, and a nut. By moving the lever of the quick-release, the wheel can be securely clamped to the bicycle without the use of tools.

The clamping force of the system is controlled by the length of the skewer, a long rod that goes through the center of the hub (Figure 1). The length of the skewer is adjusted by loosening or tightening the nut. To securely clamp the wheel, this system must be correctly adjusted and closed.

Warning  A quick-release that is not properly adjusted and closed can let the wheel be loose or come off when not expected, which can cause you to lose control and fall. Check the adjustment and close the quick-release  before you ride the bicycle.

In some cases, similar systems are used to hold the adjustment of the seatpost.

Before every ride, check that the levers of your quick-release hubs are in their CLOSE (locked) position. For further information on adjusting quick-release hubs, see the quick-release adjustment instructions, or consult your Trek dealer.

Quick-release types

There are several types of quick-release systems:

· Traditional quick-release (Figure 2). The traditional quick-release can be found on a front wheel, rear wheel, or both. If your bicycle has a traditional quick-release, read and follow the instructions for its use.

· Clix (Figure 2). Although it looks similar to a traditional quick-release device, the Clix quick-release (Figure 3) operates differently. Compared to a traditional quick-release, a Clix has additional parts (shaded in grey in Figure 2). Also, the Clix system is only found on the front wheel. If your bicycle has a Clix quick-release, read and follow the instructions for its use.