Mamil or MAMIL (an acronym standing for "middle-aged man in lycra".) is someone who rides an expensive racing bicycle for leisure, wearing professional style body-hugging jerseys and shorts.
The word was reportedly coined by British marketing research firm Mintel in 2010. It gained further popularity in the United Kingdom with the success of Bradley Wiggins in the 2012 Tour de France and at the 2012 Summer Olympics, held in London. The UCI World Championships victory in recent years have also spurred interest.
In Australia the popularity of this sort of cycling has been associated with the Tour Down Under and the 2011 Tour de France winner Cadel Evans. Former Prime Minister Tony Abbott has been described as a "mamil".
Buying an expensive road bicycle has been described as a more healthy response to a midlife crisis than buying an expensive sports car.