ARB CKMTA12 Twin vs VIAIR 400P: Which Air Compressor?

Both air up tires after a trail run, but they target different users. The ARB CKMTA12 is a permanently mounted twin-cylinder compressor with a 100-percent duty cycle and 6.16 CFM for fast fills that will not overheat on large tires. The VIAIR 400P is a portable unit that stores in the cargo area, handles tires up to 35 inches, and costs a fraction of the ARB for occasional use.

At a glance

Spec	ARB CKMTA12 Twin Motor Air Compressor Check price on Amazon	VIAIR 400P Portable Air Compressor Check price on Amazon
Price	$499 to $549	$159 to $199
Our rating	4.8 / 5	4.5 / 5
Best for	Serious overlanders who air down and air up frequently on multi-day routes and need a compressor that will not overheat.	Overlanders who air down and air up only a few times per trip and want a no-install portable option.
Output	Twin cylinder, 6.16 CFM	Single, 1.47 CFM
Duty cycle	100 percent, no overheating	33 percent, needs rest
Install	Permanent under-hood mount	Portable, no install
Best for	Frequent high-demand use	Occasional air-ups

The two options in depth

File TBG-051 / air compressors tires Best value

4.8

ARB CKMTA12 Twin Motor Air Compressor

A twin-cylinder 12V compressor with a 100-percent duty cycle, 6.16 CFM output, and a permanently mounted design built for repeated high-demand use.

VIA ARB
RATED 4.8/5

Field use Serious overlanders who air down and air up frequently on multi-day routes and need a compressor that will not overheat.

Twin cylinders produce 6.16 CFM for fast fill times on large-bore truck tires
100-percent duty cycle means it will not overheat during extended use
Permanent under-hood mount keeps it out of the cargo area
High purchase price and requires permanent under-hood installation
Not portable, so it only works when mounted in the vehicle

$499 to $549 Check price on Amazon

File TBG-054 / air compressors tires

4.5

VIAIR 400P Portable Air Compressor

A portable 12V compressor with a 150 PSI maximum working pressure and direct battery clamp connection, designed for tires up to 35 inches.

VIA AMAZON
RATED 4.5/5

Field use Overlanders who air down and air up only a few times per trip and want a no-install portable option.

Handles tires up to 35 inches in diameter effectively
Portable design stores in the cargo area without permanent install
Reliable 33-percent duty cycle is adequate for occasional use
Slower fill times than twin-piston compressors at 1.47 CFM
33-percent duty cycle requires rest periods during extended multiple-tire fills

$159 to $199 Check price on Amazon

Which should you buy?

Buy the ARB CKMTA12 if you air down and up frequently on multi-day routes, run large-bore tires, and want a compressor that fills fast and never overheats. Buy the VIAIR 400P if you air up only a few times per trip and want a portable, affordable unit with no permanent installation. The ARB is the professional-grade choice; the VIAIR is the practical middle ground at a fraction of the price.

Common questions

Is the ARB twin compressor overkill for an SUV?

For occasional air-ups on a stock-tire SUV, often yes. The VIAIR 400P handles tires up to 35 inches at a fraction of the price. The ARB pays off when you air down frequently or run large-bore truck tires that need fast, repeated fills.

How much faster is the ARB at filling tires?

Considerably. The ARB twin cylinders produce 6.16 CFM versus the VIAIR's 1.47 CFM, and the ARB's 100-percent duty cycle means no rest periods. The VIAIR's 33-percent duty cycle requires breaks during multiple-tire fills.

Does the ARB require permanent installation?

Yes. The CKMTA12 mounts permanently under the hood, so it only works when installed in the vehicle. The VIAIR 400P is portable and stores in the cargo area with no install, connecting directly to the battery.