We've all probably had flat tires on our bikes.
But how do you change one easily, quickly, and without losing time?
Watch as Olympic triathlete and Ironman 70.3 World Champ Joanna Zeiger, along with her training partner Brandon Del Campo, show you how the pro's get it done.
You'll be surprised at how easy it really is when you know all of the professional tricks of the trade.
And don't forget to visit Joanna's most excellent blog Fast at Forty.
Follow on twitter @everymantri or view latest videos on YouTube.
