Armour Tubeless displaces the small impacts but also offers a spring-like rebound for a smooth yet playful ride.Proven to be the insert of choice by Professional Racers, Red Bull Rampage Athletes, Dirt Jumpers, Enduro Racers, Weekend Warriors, and the like.Tannus Athlete Reece Wallace said \"It continually adapts to the trail while you\'re riding; it\'s not just a piece of foam that you stick in your tire. So as you move the bike, the insert changes with it.\"Fits: 2.1-2.6”3% Faster Rolling resistance then riding without an insert