Convincing overall concept: Suitable for common bike valves, small, light and fast. The Topeak E-Booster presents itself as a rock-solid breakdown helper.

Topeak's E-Booster is the largest device tested - and yet it proved to have the weakest endurance. It only managed two pumping processes at 2 bar, with the third still reaching 1.7 bar. The 160 g device took the longest to fill up.

Super light & practical: the E-Booster inflates the tyre to the desired pressure in no time at all.

The new E-Booster from Topeak is the largest device tested - and yet it proved to have the weakest endurance. It only managed to pump two 28 mm tyres to 4.5 bar during the test, after which the battery failed. It also took longer to pump than the competition.