Rings of tightly-wound steel or Kevlar fibers, which are folded into each side of a tire’s casing to form ends. When the tire is inflated, these beads hold it firmly in place against special grooves in the rim.
Derek is an avid cyclist with more than two decades of experience in the sport, and currently resides in Denver, Colorado. He enjoys all types, including road, MTB, cyclocross/gravel, commuting, and touring. When he's not writing reviews and guides related to bike accessories, parts, and gear for TreadBikely.com, he's riding, talking about cycling, or thinking about bikes he can't afford. #rolloutblissout