‘An attractive alternative to doping’ – Hackers could compromise wireless groupsets to cheat at Tour de France, study finds

Computer scientists at the University of California San Diego and Northeastern University have concluded that wireless groupsets aren’t as secure as previously thought, after successfully hacking Shimano Di2. 

Using signal jammers and devices known as software-defined radios, the researchers were able to both perform unintended shifts remotely, as well as stop a groupset from working entirely.