The result before the specs
The Milwaukee M18 Tire Inflator took a full-size truck tire from 0 PSI to 42 PSI in 5 minutes 55 seconds in my timed test. I ran it on an M18 XC6.0Ah battery.
How I tested it
I started the tire at 0 PSI, set the inflator to 42 PSI, and timed the fill with the timer visible in the video. The result was 5:55 for this tire and this setup.
That is a useful real-world answer if you are wondering whether a cordless inflator can handle a truck tire. It is one measured fill, not an average across tires, temperatures, batteries, or repeated runs.
The separate accuracy check
For a second check, the tire started at 34.5 PSI. I set the M18 to 42 PSI, let it finish, and checked afterward with a separate gauge. That gauge read 41 PSI, about 1 PSI below the setting.
This was a separate top-off from 34.5 PSI, not the final measurement from the 0-to-42 PSI timed fill. A single comparison with one separate gauge does not establish the tool’s accuracy at every pressure or across multiple runs.
What the test shows—and what it does not
In this setup, the inflator completed a full-size truck-tire fill from empty to the 42 PSI setting in under six minutes. The secondary check ended about 1 PSI below the set pressure on my separate gauge. That makes the tool worth considering for a portable, cordless way to fill or top off a truck tire.
I did not compare it side by side with an air compressor or other cordless inflators here. I also did not measure repeated-tire performance, battery runtime, or every tire size. Tire volume, starting pressure, battery condition, and the gauge used can change what you see on your own vehicle. Check pressure with a trusted gauge and use your vehicle’s recommended cold tire pressure rather than copying my 42 PSI test target.
Choose your setup
Is a cordless inflator enough for your truck tires?
Our supporting guide walks through the practical tradeoffs without claiming a compressor comparison we did not run.