Why does it matter where you wear your race bib? On the back of your race bib, is an RFID chip. If you place it on the front of your body, there will be nothing blocking it and will be read many times before it reads you for the last time crossing the finish line. If it is worn on your back, your body blocks the signal from the chip from being read. It will eventually be read but not until after you have already crossed the finish line making your time seconds slower than it actually … [Read more...] about Where to Wear Your Race Bib