Tubliss 21" x (1.6-1.85) KitGet an incredible 100psi protection at the rim, where you need it virtually eliminating any chance of damage. Tubliss employs a dual pressure chamber system by replacing conventional tubes with a high pressure, rim protecting inner bladder acting as a 360 degree rim lock that seals the tyre to the full circumference of the rim. Tubliss also acts as a 100PSI bumper, providing a protective cushion against rim damage. It also stabilises the tyre closer