Portable tire inflators

What to check before you buy

• 12-volt or cordless: a cordless one is quicker to use; a 12-volt one never runs flat as long as the car is running.
• An auto shut-off stops at the pressure you set. Check the result with a separate gauge once in a while.
• Make sure the hose or the cord reaches all four wheels.
• An inflator is not a repair: a tire that keeps losing air needs to be looked at.

How to use it

1. With a 12-volt inflator, start the engine first so the battery is not drained.
2. Screw or clip the hose onto the valve.
3. Set the pressure from the sticker inside the driver's door and start the pump.
4. When it stops, take the hose off quickly, check with a gauge, and put the cap back.

Good to know

• Underinflated tires are a major cause of tire failure.^1,2
• In a 2001 NHTSA survey, about one passenger car in four and one pickup, van or SUV in three had at least one tire well below its recommended pressure.^3,4,5
• The pressure printed on the sidewall is the most the tire should ever hold, not the pressure to drive on: fill to the vehicle's label instead.^1,6,7

How we checked this page

Checked on October 16, 2026. We kept a fact only when two independent sources agree, and each one is numbered to its sources below. We never write a price: the listings come straight from eBay and show what sellers ask. This page was written with an AI assistant and checked against the sources below.