Foam Inserts to Stop Flats?

Aaron Gwin is an American professional downhill mountain biker from Morongo Valley, California. He is a four-time World Cup overall champion.

Aaron Gwin’s secret to flat protection is Flat Tire Defender.  Flat Tire Defender is a flat protection product from Arizona. Created by tire legend, Frank Stacy. The foam inserts have already found their way to the top step of the World Cup podium and seem to be ready for their big debut. Flat Tire Defender is an ovalized foam insert that sits inside a standard tubeless or tubeless ready tire. Made from closed cell foam rubber, the inserts are airless meaning they should be fairly easy to install and won’t absorb sealant.

Available to fit multiple wheel and tires sizes, kits include two rim strips, two tire valves, and zip ties for installation. Starting with 26″ trail and enduro bikes at $109.50 for the set, prices top out at $129.50 for the 29+ kit.












Flat Tire Defender Foam Inserts features & benefits:

  • Pinch flat protection
  • Allows lower tire pressure
  • Minimizes tire & rim damage
  • Minimizes tire sidewall roll over
  • Tubeless & tube type applications
  • Fits modern day wide rim & tire brands
  • Airless Insert – no air chamber inside foam
  • Reduces vibration created by wheel assembly
  • Race proven & developed by professional athletes
  • Inspired by motorcycle off road technology

Mountain Bike racing is super competitive and tough on equipment, especially wheels & tires. Everyone’s looking to shave fractions of a second off their race time which means keeping momentum at a high level over the roughest terrain like rock gardens, tree roots, scary steep terrain and huge jumps. Today’s world of wheel & tire set-up is wide rims, wide tires, tubeless (TLR) and lowest tire pressure possible. With this set up, the biggest issues are rim damage, burping air out of the tire and tire sidewall roll over. And if you lose enough air in the tire, it can come off the rim and now you are pushing your bicycle instead of riding it. Flat Tire Defender could be a big step forward for mountain biking.

Learn more here:

Learn more about Aaron Gwin

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