Are E-Pumps Ready for Prime Time?

Cyclists have long depended on CO2 inflators for quickly filling a tire mid-ride. They’re cheap, dependable, and readily available. But there’s a problem if you’re a cyclist who travels by air. High-pressure CO2 cartridges aren’t allowed on planes.

Air travel with a bike is already tough enough. Every trip starts out something like this:

1. Wrangle your precious ride into an unwieldy case.
2. Hire a Lyft that’s big enough for said case (and the rest of your luggage).
3. Convince the airline agent not to charge you any extra baggage fees.
4. Spend the flight hoping TSA didn’t crush your new carbon wheels.
5. Wait for the hopefully intact bike to show up at your destination’s oversized baggage claim.
6. And, finally, pray that the rental-car company honors your reservation for a vehicle big enough to get you and all your stuff to the hotel.

Sorry, did I say “finally?” Not so fast.

Before the e-pump, one more task would still await you at the end of your long and tiring travel day. You’d still have to find a bike shop in a strange town and buy two-to-four cartridges that you wouldn’t even use — tire gods willing.

Enter the portable electric bike pump. Or “e-pump” for short.

E-pumps are surprisingly controversial. Not since disc brakes on road bikes threatened to slice all of us to ribbons in the 2010s has a new cycling technology garnered such hate.

They’re just one more thing that you’ve gotta charge. More e-waste that’ll end up in a landfill. What happens if you need more than a couple of fills on a long ride? And, boy, are they loud!

All true, to a certain extent. But I’m here to tell you, for the cyclist traveling by air, they’re a godsend.

Like CO2, most e-pumps are small enough to fit in a saddlebag or jersey pocket and can fill a tire far more quickly and easily than a hand pump. Unlike CO2, the e-pump is good for more than one use and can be recharged when its battery runs low. Many feature a digital gauge that lets you monitor your tire’s pressure and also set a target at which the pump will automatically shut off.

Best of all for cyclists who travel by air, they’re allowed on planes.¹ So even if you’re not ready to trust an e-pump for everyday use, they’re perfect for the friendly skies.

You Get What You Pay For?

Until recently, most e-pumps came from lesser-known companies, which made the category easier to dismiss. But that’s starting to change. Established cycling brands are entering the category, many offering expanded features and more robust warranties.

I’ve been using two of those no-name inflators (one for my gravel bike, one for my road bike):

• GPUTEK Mini Bike Tire Air Pump.
• KEPEAK Mini Bike Pump.

Both cost about $40 on Amazon when I bought them a few months apart in 2025. As you’ll see in the photos, they are nearly identical in appearance and probably came from the same Chinese factory.² I’ve been happy with them.

Still, I couldn’t help but hear my father’s voice, who always used to tell me, “you get what you pay for.” What exactly are the big boys bringing to the table? They’ve gotta be better, right? I decided to find out for myself.

After some research, I chose two higher-end devices to compare with the pumps I already had:

• CYCPLUS AS2 Ultra. $119.99. Though not exactly a major cycling brand, CYCPLUS has become well-known in the category and its pumps are found in many roundups around the Internet.
• Silca Elettrico Ultimate. $165. I’m a fan of Silca’s chain-waxing system, but the company is perhaps best-known for its highly-regarded floor pumps. Silca also sells a smaller model, the $135 Elettrico Micro, but it lacks a digital gauge, which was a deal-breaker for me.

Full disclosure: I purchased both pumps and haven’t sought or received any type of sponsorship from any of the companies mentioned. The Amazon links are for your convenience only; I’m not getting any affiliate commissions.

Early in my career, I ran a magazine that took great pride in its exhaustive lab tests of what was then cutting-edge desktop-publishing technology. This will not be that type of test. Instead, I tried to keep things simple and hopefully real-world.

I used each of the pumps to fill a 43mm tire to 30psi. I tested all four sequentially and then repeated the cycle until each unit’s battery was empty. I cross-checked pressure-gauge accuracy with Topeak’s Smartgauge D2 and found all four to be spot-on. In fact, they were significantly more accurate than either of my floor pumps.

Size and weight: Though outwardly similar, the KEPEAK and GPUTEK inflators weighed in at 125 and 120 grams, respectively. For comparison’s sake, two CO2 cartridges weigh 125 grams. The CYCPLUS AS2 Ultra looks like a close cousin, but is visibly smaller and tipped the scale at just 89 grams. It comes with a silicone sleeve (more on that in a bit) that boosts its weight to 107 grams. At 220 grams, Silca’s Elettrico Ultimate is the outlier in the group. It’s a beautiful piece of kit with its machined aluminum case and solid, expensive feel.

Speed: The three smaller pumps consistently took about 90 seconds to fill the empty tire. I expected the larger Silca to be faster, but was nonetheless surprised to see that it reached the target pressure in about half the time (42 seconds on average). In all but the closest of races, there are other factors that I think are more important than speed for a portable pump (battery life being first and foremost), but Silca was undoubtedly the winner here.

Heat: An e-pump is essentially a mini-compressor which uses a high-speed piston to force air through its nozzle. That process generates heat — and in some cases, a lot of heat. I was used to my off-brand pumps getting a little warm, but I wasn’t prepared for the CYCPLUS. Even with a few minutes between rounds, it still got too hot to hold on subsequent refills. That’s where the silicone sleeve comes into play, serving as an insulating layer between the pump and your fingers. The Silca also got warm, but not uncomfortably so (perhaps because it doesn’t need to run as long?).³

Noise: As the haters love to point out, these things are shockingly loud for something so tiny, so don’t plan on using one in a hotel while your spouse is still sleeping. (In fairness, me swearing while struggling with a mini-pump in the dark is equally loud.) The KEPEAK, GPUTEK, and CYCPLUS all came in at about 94 decibels, which is equivalent to a gas-powered lawnmower (with its silicone sleeve, the CYCPLUS dropped to 88 decibels). The Silca, which features a larger piston, was the loudest at 100 decibels.

Battery life: My pumps and the Silca all filled the tire four times before their batteries died. The smaller CYCPLUS got through three rounds and was 10psi into a fourth before shutting down. Four refills should be enough for most rides (and certainly better than what you’d get from a couple of CO2 cartridges).

It’s worth pointing out that my original pumps are both about a year old and have been charged and discharged multiple times. Though I haven’t noticed any battery degradation, they might have performed even better when they were brand new.

Finally, it is true that an e-pump commits you to yet another battery to charge. I’ve solved this by setting a monthly calendar reminder to check my tire sealant and inflator batteries. For me at least, the sealant needs topping off far more often. If I actually use the e-pump on a ride, I put it in a jersey pocket until I get home, where I fully charge it before returning it to my saddlebag.

Recommendations: What am I taking away from all of this? Despite Dad’s advice, for now at least, I’ll be sticking with my original pumps. Yes, the CYCPLUS was smaller and the Silca was faster. But these marginal gains were more than offset by the KEPEAK and GPUTEK’s better battery life and heat management compared to the CYCPLUS, and their size and weight savings compared to the Silca. And that’s before you factor in price. Were either of the newer pumps worth double or quadruple what I paid for my budget pumps? Not for me.

That said, though I still think e-pumps are a no-brainer for air travel, my tests show that they may now be ready for full-time use, especially when you consider their superior accuracy.

Retiring my old floor pump does present a new problem, of course. For years, pumping my tires manually was just about my only upper-body workout. What am I supposed to do now? Go to the gym?

1. Technically speaking, you’re allowed to have them in a carry-on bag. Lithium-ion batteries are not permitted in checked luggage. ↩︎
2. At the time of this post, the KEPEAK was listed as unavailable on Amazon but was shown on the company’s website for $129.99. Tariffs may have something to do with both of those developments. ↩︎
3. The irony here is that CO2 cartridges can reach temperatures as cold as -100°F which can literally cause frostbite depending on the type of nozzle you’re using. Damned if you do, damned if you don’t. ↩︎