CYCPLUS AS2 PRO Tiny Bicycle Pump with Gauge, Max 120 PSI Electric Mini Pump, Auto Stop, with Presta and Schrader Valve for E-Bike, MTB, and Road Bike (2025 Updated Version)

I wasn't sure what to expect with this, as it seemed like a gimmicky thing that would never work as it was advertised. However, I loathe using mini pumps, and C02 pumps are a pain to carry and not always advised for certain setups. I've now had this thing for a bit and have used it to top off my tires, inflate new tubes, and also to seat tubeless tires on tubeless rims on four tires now, without issues. Overall, the size if this thing is surprisingly small, and it packs in any of my bike bags easily. It feels sturdy in the hand and like it could take a few drops on a hard floor. Installation for inflating tires with Presta valves can be a little tricky, as you've got to seat it down pretty hard on the valve to seal the opening. Also, do not try to seat your tubeless tires with the valve core removed. When I tried that, air just kept escaping. Putting the valve core back in allowed me to get the magic ping as I inflated the tires. No need for an air compressor! And I would say the complaints of the noise level on this thing are a bit exaggerated. Sure, it's not the most pleasant sound, but definitely better than an air compressor. I have not yet verified the accuracy of the built-in gauge, but it is super handy to have a gauge on-hand that is built into the pump. I will say that I was able to inflate two 2.3" 650b tires with tubes, then later seat those tires when converted to tubeless before I had to charge it again. For a ride where you might need to top off your tires, and worst case re-inflate after a patch or tube change, it should be more than adequate. My only complaint is the buttons and placement of the screen. As someone with CMC joint arthritis, pushing the buttons in or holding them down to pump tires is a painful and awkward affair. The screen can be hard to see depending on your vantage point, but I guess there is not really a better place to put it where it would work ambidextrously. Overall, this was a worthwhile purchase and I feel super happy it works to seat tubeless tires.

The CYCPLUS tiny electric pump is a surprisingly capable tool in a very compact form. I’ve used it for my road bike (high-pressure presta tires), and it handled without issue. It reaches the advertised PSI (up to 150) and shuts off automatically at the set pressure, which is a big plus. Battery life is solid, I’ve gotten multiple inflations on a single charge. Build quality is excellent, and it fits easily in a jersey pocket or saddle bag. It’s a great emergency pump for cyclists who want an alternative to CO2 cartridges or manual pumps. The digital gauge is reasonably accurate, and it charges via USB-C, which is convenient. Highly recommended for anyone looking for a reliable, portable inflation solution on the go.

I really love this little pump! I use it as a backup inflation solution on my Canyon Speedmax triathlon bike with tubeless tires, and it fits perfectly in the bike’s frame-integrated toolbox—a major win for space-saving. The connection to a Presta valve is seamless: just push it on—no twisting, no fuss—and it forms a nice, tight seal. The electronic screen version is well worth the slight price increase, offering easy controls and accurate PSI readouts so you know exactly where your pressure is, with not much of an increase in size and weight. That peace of mind alone is a huge bonus. Yes, it’s pretty loud (especially indoors), but it fills quickly, especially up to the 60-65 PSI range I use for my tubeless tires. It can take a little longer getting up to 100 PSI for my clinchers, but for a pump this small, that's expected. I personally use this for emergency roadside inflation only. Day-to-day, I rely on the larger Cycplus "Electric Air Compressor Portable Bicycle Pump Car Tire Inflator" at home. But the beauty of this model is that I no longer need to carry CO2 cartridges or adapters. (Okay—full honesty: I still carry CO2 during Ironman races because I'm overly cautious. But that's me, this pump could be your only solution.) In short: compact, capable, and incredibly convenient. This little device makes bike prep and packout simpler and lighter—what more could you want?

I’ve been using this pump regularly for months. I use it every day to top up my tubeless 700x19 presta tires before riding as seen in the video. It’s small and carries nicely in my jersey pocket, is relatively light, and well made. There’s more than enough battery to inflate the tires a couple of times. It charges quickly so I top up the tires, put it back on the charger, finish getting ready to ride (5-10 minutes), and then put the fully charged pump in my jersey pocket. I also use it to top up my motorcycle tires. It can add ~3 psi in about 2 minutes into a 195/55-17. I don’t rely on it to reinflate that tire; I carry a 12V pump that runs off the motorcycle battery for that. While it can get hot when running for a minute or so, the included form fitting cover buffers the heat and stays on the unit all the time.

Works surprisingly well! I have not pumped tires from full flat yet to see how much actual battery life it has, but very impressed with quality! Rather expensive, but it replaced a much larger pump in my trunk bag and gives me much more carry space. Nice to have in my bag when I’m 20 miles from home!

This little pump is amazing and doesn't take up much space in my bike bag. It pumps up quickly and precisely - which i love! Pick the amount of pressure and it pumps until it hits the target. I run tubeless on my road bike and it does great! I use it to pump up other riders tube/tires which requires more pressure - but no problem! This is a great little pump and worth every dollar!

Perfecto, pequeño y funciona muy bien.

Die Pumpe ist recht gut. Ich verändere - je nach Untergrund - gerne mal den Druck. Dafür ist sie ideal. Klein u. leicht. Druckanzeige ist sehr gut und man kann den Zieldruck einstellen. Etwas laut aber ok.

+ Bra batteri. Tillräckligt snabb. Bra display och lätt att ställa in önskat tryck. - Aningen stor. Inte vattentät. Aningen dyr.

Perfect pump that fits in your jersey. No need to carry CO2 anymore. Very easy to use and the digital readout lets you know when you are at the desired pressure.

J’étais hésitant et sceptique concernant la performance d’un si petit compresseur/gonfleur des pneus pour les vélos. Finalement j’ai décidé de l’acheter. Je suis agréablement surpris car il est compact pratique et simple d’utilisation et je l’ai trouvé performant dans son rôle. Il tient dans la poche donc facile à transporter. Personnellement je recommande ce produit