Bearing failures are rare. Usually just grease leakage, and not really a "failure." Still, it's still a good idea to keep a couple spares on hand, since they are easily replaced and very inexpensive. Please note: this bearing is for the Lightweight Tire and Condor2 only. It will not fit our Deluxe tire.
Sold individually. There are two bearings in each wheel, so buy two for a complete set.