Popping a bike tire is one of the biggest annoyances of cycling — but sometimes, it can actually save a life.
Just ask Eduardo Reis.
A little over a year ago, Reis was on a training ride with a few friends on a quiet road near his home in Brazil when someone in the crew got a flat. Naturally, they all pulled over so the punctured tire could be fixed.
Little did they realize, however, they were not alone.