Tannus Armour 26 × 4.0 Fat-Tire Insert – Flat-Free Protection for Your Fat-Bike & E-Bike

Say goodbye to mid-ride flats and hello to carefree cruising on Iowa’s gnarliest gravel or your neighborhood greenbelt. The Tannus Armour 26 × 4.0 Tire Insert slips between your tube and fat-tire, wrapping it in a 360° multi-cell foam “helmet” that blocks thorns, glass, goat-heads, and rim-pinch impacts—so you can ride harder, run lower PSI, and still make it back for tacos. Why Riders Love It Stops 90 % of punctures with 15 mm of impact-absorbing Armour under the tread and 2–5 mm on the sidewalls — no more cactus spikes or pinch flats ruining your day.  E-bike ready. The proprietary compound is torque-tested to handle high-powered motors and the extra weight of fat-tire e-bikes.  Ride softer, grip harder. Lower your tire pressure for extra traction and silky comfort without risking snake-bites or rim dents.  Rim-saving cushion. Armour eats up rock strikes, protecting expensive wheels on rough single-track or curb hops. DIY-friendly install. Pops in with standard tire levers—