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Flat Tire Defender is the original foam insert designed for mountain bike competition. FTD has lead the charge since 2015 winning our first Enduro World Series championship & World Champion Downhill titles and backing those up with 2016 & 2017 World Cup Downhill series championship and USA National championship titles. What we learn from racing we put towards the next generation of Flat Tire Defender… Introducing FTD II.

The four-time World Cup Champion Aaron Gwin reveals his secret race weapon:

Performance Testing: 

FTD II is 40% wider to maximize rim protection and dampen out suspension harshness on rough terrain, 30% taller to maximize tire sidewall support and allow lower tire pressure for increased traction, light weight to minimize rolling resistance and un-sprung weight, excellent high quality foam rubber based material (no pool noodle here). All this at a very affordable price!

Based on Flat Tire Defender field testing, we’ve found on average, tire pressure can be reduced approximately 10% from a tubeless tire pressure without foam inserts.

PSI Guide*

FTD II (27.5″ & 29″): Range 24psi to 29psi

  • Fits Inner Rim width 28mm to 40mm
  • Kit Contains Foam Insert & Valve Stem
  • Super glue is provided to assist in adhering the two ends together.


  • Recommended Tire Width 2.30/2.80
  • 27.5″ Weight 200-220 grams (each)
  • 29″ Weight 230-250 grams (each)

Watch Install Video:

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