For three reasons. Firstly, it’s a tradition, cyclists have shaved their legs for decades. Secondly, it has a healing function – due to the high likelihood of a fall in cycling and the loss of skin; hair removal encourages faster healing as the hairs don’t tangle in the inevitable scab. This helps the abrasion to heal quicker and there is also less chance of infection. And thirdly, it is easier to massage shaven legs and cyclists need more massages than participants in most other endurance sports.