Flat tires come with cycling like rain comes with weather. But where you used to sweat by the road with a hand pump or fumble for a CO2 cartridge, there's now a better alternative: the Cycplus AS2 Ultra. At just 87 grams, it's the lightest electric bike pump in the world — and it fits in your saddle bag.
What is the AS2 Ultra?
The Cycplus AS2 Ultra is an ultra-compact, rechargeable electric mini-pump for bikes. It weighs a mere 87 grams and measures just 65 × 47.5 × 28 mm — small enough to disappear into a jersey pocket or saddle bag. Despite its tiny dimensions, it reaches a maximum pressure of 120 PSI (8.3 bar), which is more than enough for road, gravel and mountain bike tires.
Technical specifications
| Weight | 87 g |
| Dimensions | 65 × 47,5 × 28 mm |
| Max pressure | 120 PSI / 8,3 bar |
| Accuracy | ± 1 PSI |
| Battery | 400 mAh, 7,4 V |
| Charging time | 25 minuten |
| Charging port | USB-C |
| Valve compatibility | Presta (SV), Schrader (AV) |
| Motor | Borstelloos (brushless) |
| Housing | Magnesiumlegering |
| Display | LED, PSI / bar schakelbaar |
| Auto-stop | Yes, at preset pressure |
Prices from 9 November 2026, excluding AliExpress. Clicking a price shows today's current price; use “Prices in other countries” to compare countries.
How does it work?
Operation is child's play. You long-press the power button, set the desired pressure with the plus and minus buttons (in PSI or bar — switch by pressing both simultaneously), then short-press the button to start pumping. The pump stops automatically once the preset pressure is reached. You don't even have to stand over it.
The LED display shows real-time pressure and remaining battery life (three bars). The pump features a brushless motor that ensures fast airflow: 80 PSI in about 50 seconds, and 120 PSI in a maximum of 2 minutes.
Capacity per charge
On a full battery you can inflate two 700×25C tires to 110 PSI, or three to four tires to 80 PSI (5.5 bar). That's more than enough for a long ride — and a far cry from a single-use CO2 cartridge. The battery fully charges in 25 minutes via USB-C, meaning you can top it up during a coffee stop.
Compatibility and accessories
Out of the box, the AS2 Ultra is compatible with Presta valves. For Schrader valves you use the included adapter. The set contains everything you need:
- AS2 Ultra pump with silicone protective cover
- Extension hose (TPU-friendly)
- Presta valve head
- Ball needle
- Spare O-ring
- USB-C charging cable
- Splash-proof pouch
- Manual (7 languages)
Pros and cons
Pros
- Lightest electric bike pump in the world (87 g)
- Compact enough for saddle bag or jersey pocket
- Digital pressure gauge with ±1 PSI accuracy
- Auto-stop at preset pressure
- Fast charging (25 min via USB-C)
- 120 PSI max — enough for any bike
- Replaces CO2 cartridges — better for the environment
- Multiple inflations per charge
Cons
- Motor is loud during pumping
- Pump gets hot during multiple consecutive inflations
- No waterproof rating (no IPX rating)
- Limited battery capacity — max 2-3 tires at high pressure
Conclusion
The Cycplus AS2 Ultra is an impressive piece of technology. It may not be the fastest or most powerful pump on the market, but it is the lightest and most compact with a digital pressure gauge. For those who count every gram and no longer want to rely on CO2 cartridges, this is the pump. It disappears into your pocket and you forget it's there — until you need it.
More information and ordering available on the official Cycplus website.
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