Pirelli Scorpion Smartube 29X2.2 skate New leak-free Dolphin Breather Valve

New leak-free Dolphin Breather Valve technology keeps liquids inside

Battery: 500 mAh Lithium Polymer

Provides the ultimate performance in both wet & damp or dry & dusty conditions

And when it comes to the trainer itself

Elastic arch and leg support

Pirelli Scorpion Smartube 29X2.2 skate New leak-free Dolphin Breather ValveScorpion SmarTUBE is the mountain bike specific inner tube that blends the innovative features of TPU (Thermoplastic Polyurethane), a specific formulation for the riders that are looking for the best balance between protection against punctures, weight and volume. Scorpion SmarTUBE is a one of a kind inner tube: low weight and volume combine with a high level of reliability not available with an equivalent butyl tube. The perfect solution for marathon