Viair 400P Automatic.

If you’re on oversized tires, the Viair 400P Automatic is the heavy-duty pick I recommend because it moves serious air volume at about 2.3 CFM. The trigger-style inflation gun and pressure switch behavior make it easier to use without constantly walking back to the unit, and it inflated a 35-inch tire from 15 to 30 PSI in roughly 2 minutes in my testing.

Pros

+Very fast inflation with high airflow (about 2.3 CFM)
+Trigger-style inflation gun stops pumping when you release the trigger
+33% duty cycle at 100 PSI for demanding use
+Built for abuse with sand-resistant switch gear
+Vibration-dampening base plates and carrying case included

Cons

-Heavy and bulky to store
-Overkill for standard sedans

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Viair 400P Automatic.

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Highlights

+Very fast inflation with high airflow (about 2.3 CFM)
+Trigger-style inflation gun stops pumping when you release the trigger
+33% duty cycle at 100 PSI for demanding use

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