The TANNUS ARMOUR for your 20x4 wheel helps you passively prevent most of the flats.
Contains protection for one wheel. You need one Tannus protection per 20x4 wheel, and you mount it between the inner tube and the tire.
Armour is positioned between the inner tube and the tire. It offers 15 mm of extra protection under the tread and 2-5 mm on the sides of the tire. Armour increases puncture protection, reduces maintenance and increases comfort.
Tannus Armour protects your inner tube against 90% of flats using 15mm of multi-cell foam. The best anti-puncture protection for your bike. Say goodbye to punctures.