Since each wheel’s TPS (tire pressure sensor) has its own unique code and frequency, for 2017 Michelin is experimenting with pairing the tire serial to the TPS. The plan is to scan each rim prior to the start of the race in order to better track which tire compounds each rider has chosen for the race. Sharp-eyed fans can still look for the color coding that is used as a visual means of determining a tire’s compound. For slicks, white denotes soft, while no color is for the medium compound. Yellow marks the hard compound tires.