SmarTUBE X: Maximum robustness and puncture resistance, for an urban, gravel or e-bike use.   The Pirelli SmarTUBE inner tube family is made of thermoplastic polyurethane TPU) that is a characterised by high elasticity and mechanical resistance, and extreme lightness. Pirelli SmarTUBE X TPU inner tubes are designed for use with the Pirelli CINTURATO and ANGEL…