In our big group test, we already put the best electric mini pumps through their paces. Now CYCPLUS are entering the ring with the AS2 Ultra, a pump that at first glance looks more like an oversized lighter than a serious bit of kit. But looks can be deceiving. With the AS2 Ultra, CYCPLUS are making a bold statement when it comes to miniaturisation.
Armed with the insights from our group test, we subjected this new contender to our proven test protocol. The figures alone are impressive. At 90 g without the silicone sleeve (106 g with it), the CYCPLUS AS2 Ultra is lighter and more compact than any pump we’ve previously tested, and that includes models without a display. Despite the tiny housing, it comes with a 400 mAh battery. On paper, that might not sound like much, but given the size, it’s surprisingly big. The key question is whether that capacity is enough to bail you out on the road and beyond.
On Review: What is the CYCPLUS AS2 Ultra really capable of?
The first time you pick up the AS2 Ultra, you can’t help but wonder where the power is hiding. Measuring just 65 x 48 x 29 mm, it almost disappears in the palm of your hand when you close your fist.
Straight out of the box, the AS2 Ultra is compatible with Presta valves. If you’re using Schrader valves, you’ll have to use the supplied hose attachment. Speaking of what’s included, CYCPLUS also provide a drawstring carry bag, a ball needle, a charging cable and spare seals.
Press the power button and the tiny compressor whirrs into life. In just under a minute, it pumps a 28 mm Schwalbe Pro One road tire up to 5 bar, and manages to do this three times in a row on a single charge. On the fourth attempt, though, it runs out of battery.
In terms of speed, the CYCPLUS sits comfortably in the top half of our 2025 group test. After three full inflations, however, the battery is toast, which drops it into the lower half of the rankings for outright endurance. But let’s be honest. By the time you’re dealing with your third puncture on a single ride, it is not just the pump that has had enough.
One critical issue with such small, high-revving compressors is heat build-up. Friction generates warmth, and high compression does the same. That much is obvious. Thankfully, CYCPLUS include a silicone sleeve, and it’s far more than a cosmetic extra. It’s essential if you value your fingertips. The sleeve absorbs vibrations and shields you from the heat the pump produces. That heat can quickly become a real concern, especially if you are running temperature-sensitive TPU inner tubes.
Who is the CYCPLUS AS2 Ultra for?
The AS2 Ultra is the ideal companion for road riders and performance-focused cyclists who count every gram but would rather avoid the unpredictability of CO₂ cartridges. It’s also a great fit for commuters who plug in their kit regularly anyway and can keep the battery topped up without a second thought. However, if you’re heading off-grid for weeks at a time with no access to power, or you need to inflate seriously high-volume tyres such as those on a fat bike, you would be better served by a larger electric pump or a traditional track pump. The AS2 Ultra is a specialist built for quick, precise top-ups. It is not a long-haul workhorse.
Conclusions: Would we Buy the CYCPLUS AS2 Ultra?
Yes, we would. The CYCPLUS AS2 Ultra is about as mobile as it gets. At just 106 g including the silicone sleeve, and with an exceptionally compact housing, it’s the ideal companion on the road and disappears even into the smallest jersey pocket. Being able to inflate three tires on a single charge is impressive for a pump of this size. On top of that, you can set your desired pressure precisely via the display, something most mini pumps in this class simply do not offer. At around € 100, CYCPLUS have put together a very compelling overall package.
Tops
- Very small and lightweight
- Adjustable pressure via display
Flops
Find out more on cycplus.com
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Words: Christoph Staudinger Photos: Lars Engmann