What to do when… | The cam levers are too loose or too tight

On iruka, cam levers are used in the following five locations:

 

1. Handle post height adjustment lever

2. Handle locking lever

3. Front fork locking lever

4. Saddle height adjustment lever

5. Seat post locking lever

 

 

A cam lever is a mechanism that uses a cam-shaped (eccentric circular) structure at the base of the lever. When the lever is pushed down to the closed position, axial force is applied through the shaft, clamping the parts together. When the lever is lifted open, the pressure is released, allowing the parts to be disengaged. This type of mechanism is also known as a quick-release clamp.

 

 

 

If the cam lever’s clamping force is too weak, the part may move or even come loose during riding, which can lead to accidents. Be sure to check the clamping force every time before riding. Adjust the lever so that it is as tight as possible while still being closable by hand. As a rule of thumb, the lever should leave a noticeable mark on your palm after closing it.

 

 

You can fine-tune the clamping force by turning the adjustment nut on the opposite side of the lever. Rotating this nut changes the effective length of the shaft, which in turn adjusts how tightly the lever clamps when closed. If the clamping force is too weak, lift the lever to the open position and turn the adjustment nut clockwise little by little. If the lever is too tight to close completely, turn the adjustment nut counterclockwise until you can fully close the lever.