Milwaukee M18 Inflator vs DeWalt 20V Inflator: Which Cordless Tire Inflator Wins?

Introduction

Cordless tire inflators have become one of those tools that quietly earns its place in the truck bed. In this comparison, two heavyweights in the job-site battery world go head to head: the Milwaukee M18 Inflator and the DeWalt 20V Inflator. One is a dedicated tire-airs-up machine with serious speed, while the other tries to do a bit more with extra features. Here is how they stack up.

Size and Portability

The two units take noticeably different approaches to size. The Milwaukee runs longer and lower, coming in at 13.75 inches long and just under 8 inches tall. The DeWalt is shorter and wider, at roughly 12.2 inches long but around 10 inches tall and nearly 6 inches wide, where the Milwaukee measures about 6.5 inches at its widest point.

If sliding the inflator behind a truck seat is the goal, the DeWalt has the edge. The Milwaukee is a bit thinner, though, which helps it fit into tighter gaps elsewhere. It also ships with a roughly four-foot braided hose with a clip to keep everything stowed neatly, a small but genuinely useful touch.

Performance Test: 65 to 70 PSI

To compare real-world speed, both inflators were tasked with raising a truck tire from 65 PSI to 70 PSI, a demanding range well above what most passenger car tires need. The DeWalt handled it automatically and finished with only a slight overfill, which is easy to account for when you remove the hose.

The Milwaukee, run manually, was remarkably quick. The 5 PSI climb took somewhere in the ballpark of 15 to 30 seconds, a pace that genuinely surprised expectations. At lower pressures, like bike and dirt bike tires, the DeWalt is perfectly adequate, but at higher pressures it clearly struggles while the Milwaukee runs circles around it.

Features: Where the DeWalt Pulls Ahead

The DeWalt offers more utility beyond just tires. It has a high-volume port for inflating things like air mattresses and other inflatables, which the Milwaukee lacks entirely. It also includes a 12V cigarette lighter adapter, so even with a dead or missing battery you can power it from your car or truck. A built-in light rounds out the more utilitarian, multi-tool character of the DeWalt.

The Milwaukee is purely a tire inflator, but it backs that single focus with True Fill technology and a longer braided hose. It also carries a full five-year warranty, while the DeWalt offers three years, a meaningful difference for a tool category where small compressors do not always have the longest lifespan.

Price and Value

Pricing plays a big role here. The Milwaukee M18 Inflator is typically around $179, though a bundle at Home Depot with the tool, two 5.0Ah batteries, and a charger has been available for about $200. The DeWalt generally sits around $120 to $140, and deals around $99 have popped up in the past.

Both are fairly expensive compared to the wider market, but if you are already invested in either battery platform, the value calculation changes quickly. The Milwaukee bundle is especially hard to beat if you need batteries anyway.

Which One Should You Buy?

If you mostly air up trailer tires, truck tires, or anything at higher pressures, the Milwaukee is the stronger pick. Its speed at high PSI is in a different league, and the five-year warranty plus the current bundle pricing make it easy to recommend as a dedicated compressor.

If you want a lighter-duty inflator with more flexibility, the DeWalt makes sense. The high-volume port for inflatables, the cigarette lighter power option, and the built-in light give it real everyday versatility that the Milwaukee simply does not offer.

Conclusion

Both of these are excellent compressors, but they serve different buyers. The DeWalt is the more feature-rich, general-purpose option for lighter use. The Milwaukee is the performance-focused tire inflator, and on raw high-pressure speed it outclasses the DeWalt on the same tire. For anyone who regularly airs up truck or trailer tires, the Milwaukee is the one to beat.