Thermoplastic polyurethane changes the equation for inner tubes. Where butyl rubber has served cyclists for decades, TPU delivers the same air retention in a material that weighs dramatically less and packs smaller. Pirelli's P Zero SmarTUBE EVO applies this technology in a tube developed with World Tour team feedback, refining the formula beyond the standard SmarTUBE to approach latex-like ride quality while eliminating latex's daily air loss and fragility issues.

The weight savings justify the price premium for riders chasing grams. At 35 grams for the 42mm valve version, the SmarTUBE EVO cuts roughly 70% compared to equivalent butyl tubes that typically weigh 100-120 grams. Across a pair of wheels, that represents meaningful rotating weight reduction right at the rim where it matters most for acceleration. The tube also compresses to about half the volume of butyl, making it practical as a spare that actually fits in a jersey pocket or small saddle bag without crowding out other essentials.

Rolling resistance drops 5% compared to Pirelli's standard SmarTUBE, which already tested favorably against butyl alternatives. Independent testing places TPU tubes in the same performance range as tubeless setups with sealant, offering a compelling option for riders who want tubeless-level efficiency without the setup complexity and maintenance. The thin TPU material conforms to the tire casing without the stiffness of thick butyl, contributing to improved road feel and comfort at equivalent pressures.... Read More