2 cases of damage to peripheral nerves following bicycle riding are described in males aged 13 and 35 years, respectively. In 1 there was injury to the ulnar nerve at the level of the wrist, with hypesthesia of the 2 ulnar digits and paresis of intrinsic muscles. In the other case there was involvement of the pudendal nerves with numbness of the buttocks and genitalia, and with difficulty in achieving erection. After cycling was stopped for a few weeks the symptoms disappeared spontaneously, with full recovery. Once symptoms subside completely cycling can be resumed, although with certain precautions.