Flats are the most common reason a vehicle comes into our service center, and on a heavy e-bike they are considerably more work to fix than on a pedal bike. Tannus Armour wraps around the tube and adds up to 15mm of puncture protection, which removes most of the causes before they happen. Features Up to 15mm of puncture protection around the tube Run-flat technology lets you keep riding on a flat tire to get home Engineered for e-bikes, so it stands up to the torque Installs like a tube, with no special tools Sizing Size Fits 20 x 4.0–4.8 Super73 20 x 3.0–4.0 Zooz Ripster 24 x 2.0–2.5 Zooz 20 x 1.95–2.5 JackRabbit Installation is best done at the same time as a tire or tube change. Our service team can fit them while the wheel is already off.