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Best electric pumps for gravel (should you ditch the CO2?)

Last checked: Oct 23, 2026. Product details come from the retailer pages we checked (and are claimed figures, not our test results). Race figures come from each race's page, which cites the organizer.

Flat mid-race? The fix, in order

1. Get off the course line. Pull fully off the road or trail before you look at the tire. Gravel packs are fast and dusty.
2. Spin the wheel and listen. On tubeless, a small hole often seals on its own if you turn the hole to the bottom and let sealant pool there for a few seconds.
3. Plug it if it won't seal. Most race-day tubeless flats are small holes. A plug fixes them in a minute or two.
4. Add air. This is where your pump or CO2 comes in. With an e-pump you can stop at your race pressure; with CO2 you get one shot.
5. Tube as the last resort. If the sidewall is cut, boot it and put a tube in. A tube needs a full fill from flat, which is the most air you'll ask of any inflator all day.

Practice this once at home. Doing it for the first time at mile 20, with riders flying past, is when beginners lose the most time.

Is CO2 worth carrying on race day?

Our take: yes, carry one cartridge and a head, but don't make CO2 your only plan. It's the fastest fix when you're chasing a cutoff, and it's the backup if your pump battery is flat. What it can't do well is the small top-up you often need after a plug, because you can't stop a cartridge halfway. Many riders also let the CO2 out and refill with air after the race, because CO2 tends to seep out of tires faster than air.

What fits in a jersey pocket or frame bag

• Jersey pocket: a pocket-size e-pump like the SILCA Elettrico Micro Mini (Jenson lists 111 g), or a CO2 cartridge and head. Keep the e-pump in a pocket on a cold morning, since batteries generally don't like cold.
• Frame bag or top-tube bag: a bigger e-pump like the HiLine E-Pump Boost (a claimed 207 g), plus plugs, a tube and levers, so the whole flat kit lives in one place.
• On the frame: a hand pump like the OneUp EDC, which its listing says mounts beside a bottle cage and doubles as a CO2 inflator.
• Saddle bag: the tube, boot and a spare CO2, the stuff you hope not to touch.

The full list by distance is in our packing list.

Topping up tubeless after the sealant seals

Here's the flat beginners don't expect: the sealant does its job, the hiss stops, but the tire is now soft. Riding on it risks a rim strike or a burp. This is where an e-pump earns its spot. Thread it on, watch the reading and stop at your race pressure. You might do it two or three times in a rough race, which is the main reason a pump with several fills per charge beats a single cartridge. Before you thread a pump on, make sure the valve core is snug, and carry a valve core tool: a head that screws on can loosen a removable core when you take it off. If you run hookless rims, a pump with an automatic stop at a safe pressure is a nice backstop.

Real races where your inflation plan matters

How much backup you carry depends on how far you are from help. Here are shorter courses from races we track.

"Longest gap" is the longest stretch between feed zones (or the finish) where the organizer publishes feed-zone miles; "—" means the organizer doesn't publish feed-zone miles for that course, or there's no aid at all. Where there's no outside support, you're on your own between official stops.

• Bighorn Gravel: even the Little Bighorn (52 mi, 5,700 ft) is high, rough Colorado backcountry. The organizer recommends at least 38 mm tires with liners and warns of big stretches with no cell service. On a course like this, carry two ways to inflate.
• Southern Cross: the 50 mile has a time cutoff at the first pass of the aid station (mile 12). A flat early on is where a fast CO2 shot can save your race.
• Spring Valley Wilder 100 (formerly Almanzo 100): the Wilder 65 is self-supported, with no hand-ups and no chase vehicles. Bring the e-pump and a CO2, and know how to use both.
• Crusher in the Tushar: no outside support is allowed anywhere on the Crusher course, so whatever you carry is all you get.
• Barry-Roubaix: the Thriller (36 mi) has a feed zone at mile 22. On a short, supported course like this, one e-pump or a hand pump plus plugs is plenty.

Rough courses also chew through tires. See tires by terrain for what to run.

What to look for in an e-pump for gravel

• Fills per charge. This is the one that matters for gravel. Big 40–50 mm tires hold a lot of air, so a pump that fills several road tires might manage fewer gravel ones. Makers state it differently (seconds of runtime, "tires per charge" or CO2-cartridge equivalents), so test yours at home: deflate a race tire and time a full fill from flat.
• Pressure. Gravel tires run low, well under the caps on the pumps below, so max PSI matters less than for road.
• Charging. USB-C is the easy one to top up on a road trip. Charge it the night before, every time.
• Valve fit. Make sure it fits Presta, and check how the head attaches.
• Seating tubeless. Seating a stubborn bead takes a big rush of air. Most riders do that at home with a compressor or a floor pump with a charge chamber. Only buy for this if the listing says the pump does it.

The pumps we'd look at, side by side

All figures are as listed by the retailer on Oct 23, 2026. Fills per charge are the maker's claims for their own test tires; gravel tires sit between road and MTB in volume, so expect your number to vary.

Which setup for your race

• First race, 30 to 60 miles, aid every 20 miles or so: a pocket e-pump like the SILCA Elettrico Micro Mini, plugs and one CO2 as backup.
• Rough or remote course, or self-supported: two ways to inflate, e.g. an e-pump plus CO2, or a hand pump plus CO2.
• You want one pump that also seats tubeless at home or the trailhead: a high-output pump like the HiLine E-Pump Boost. It's the bigger-ticket option and heavier than a pocket pump.
• You hate charging things: a solid hand pump. The OneUp EDC Pump also works as a CO2 inflator, so one tool covers both.

The Gravel Stash isn't affiliated with any race or pump brand listed here.