The origin story of Tullio Campagnolo’s wheel quick release centres on the Croce d’Aune pass, where cold fingers made wheel nuts difficult to undo during a race. The episode is usually dated to 1927, although accounts differ. He patented the cam-lever mechanism in 1930.
The mechanism turns lever movement into clamping force. Closing the lever secures the wheel axle against the frame or fork ends; the nut on the opposite side adjusts the closing force. The lever is therefore more than a handle for tightening a thread.
This small component illustrates how improvements to everyday tasks shape bicycle development. Its practical value appears not only while riding, but when a wheel needs removing or refitting. Correct adjustment and fully closing the lever remain essential.