Pirelli has released its new SmarTUBE inner tubes for road and gravel, with huge weight and space savings promised. The lightest tube is the 23mm narrow P Zero SmarTUBE that comes in at a claimed weight of 35g, which if accurate is lighter than both Tubolito’s Tubo Road 700c at 38g and the Schwalbe Aerothan at 43g.
Available for £27.99, Pirelli’s new inner tubes are designed to enhance the performance of its road racing P Zero and endurance Cinturato models.
“Made from a thermoplastic polyurethane (TPU), it can save up to 70% of the weight of a general butyl tube and almost 50% of the space in your pockets, while being stronger than butyl as a raw material,” says Pirelli.
The Italian brand says the benefits over butyl tubes are a reduced rotating mass for livelier handling and quick accelerations, as well as saving space in your jersey pockets or saddle bags so you can carry more nutrition.
There’s also a reinforced Cinturato SmarTUBE model for double the puncture protection compared to a standard butyl tube.
These seem to be reasonably lightweight for the resistance promised and Pirelli says the reinforced tubes are also compact when folded away as a spare.
The SmarTUBE inner tubes are available in a wide range of sizes, and also weights:
The inner tubes come equipped with a 60mm Presta Valve to work with the majority of rim depths. Although one of the Cinturato SmarTUBE sizes, the 700x35c option, has a 42mm Valve instead.
These claimed weights are very light.
Tubolito has its CX/Gravel inner tube (£27.99), with a new single model that works with both 650b and 700c wheels, for tyre widths from 30mm up to 47mm. This weighs in at 60g with a 42mm Presta Valve, and 61g with a 60mm Valve.
Although the Austrian brand does also have its even lighter spare tube model, the S-Tubo-CX/Gravel All, that weighs 35g with a 42mm Presta valve.
Tubolito’s lightweight tubes came in orange, and Pirelli’s offerings follow this bright theme with theirs available in yellow. It's no surprise these are aesthetically similar as both the Pirelli and Tubolito tubes use TPU.
Unlike Tubolito who also use orange valves, you won’t be able to spot a rider using Pirelli’s ultra-lightweight tubes as the valves are black for a clean finish; the Schwable Aerothan also uses black valves.
If you're sold by Pirelli's take on the ultra-light inner tube, they're available to buy now on the Pirelli website.