A tire inflator tops up your car tires, and an air compressor with a tank also runs air tools. Transport Canada says to check your tire pressure at least once a month, so a good inflator earns its spot in the garage. Here are four top sellers, and the question to answer before you buy: tires only, or tools too?
Quick answer
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If you only need to keep tires at the right pressure, buy a tire inflator. If you also want to run air tools, you need a tank compressor, and its tank size and air delivery matter.
A simple place to start: the DEWALT 20V MAX Cordless Tire Inflator. Its Amazon description lists three power sources, a 20V MAX battery, 12V DC or 110V AC, and an automatic shutoff. The title says Tool Only, so a battery is sold separately. No DEWALT battery? Look at the AstroAI AIRUN H, which plugs into a 12V car outlet.
Four ways to inflate, by what you need
| Product | Best for | |
|---|---|---|
| DEWALT 20V MAX Cordless Tire Inflator, Tool Only | Best if you already own DEWALT 20V MAX batteries. The title says Tool Only, so a battery is not included. The Amazon description lists three power sources (a 20V MAX battery, 12V DC or 110V AC), an automatic shutoff, a digital readout with high-volume inflation and deflation modes, an LED light, onboard accessory storage and a threaded chuck for a secure connection to the valve. 700+ bought in the past month on Amazon when we checked. | See price |
| AstroAI AIRUN H Tire Inflator Portable Air Compressor | Best for a low-cost inflator that lives in the glovebox. It plugs into a 12V car outlet with 15A fuse protection and has a 120W motor. The description lists an auto stop at the pressure you preset, four pressure units, a backlit display, an LED light and a 2-year limited warranty. It says the unit shuts off after 15 minutes of continuous use and recommends a 10-minute cool-down. 1K+ bought in the past month on Amazon when we checked. | See price |
| Metabo HPT Quiet Air Compressor, 1 Gallon, 125 PSI | Best for a small, quiet tank compressor for the garage. The description lists a 1 gallon tank, 125 PSI, an oil-free pump, 59 dB operation, motor overheat protection, a quick coupler, a stainless steel braided hose, a regulator with gauges and a 1-year warranty. 100+ bought in the past month on Amazon when we checked. | See price |
| King Canada 8438 3 Gallon Oil-Free Air Compressor Kit | Best if you want a larger tank. The description lists a 3 gallon tank, an oil-free design, 110V at 2.5 amps and air delivery of 1.0 SCFM at 40 PSI and 0.60 SCFM at 90 PSI. It is sold as a kit, so check the Amazon page for what is included. 100+ bought in the past month on Amazon when we checked. | See price |
Features come from Amazon descriptions and can change, so check the current description before you order.
Do you need a tire inflator or an air compressor?
If the job is tires, bike tires and the odd ball, a tire inflator is built for it. The AstroAI and DEWALT descriptions both list a digital readout and an automatic stop, so you set the pressure and walk away. The AstroAI runs from the car outlet, and the DEWALT lists a battery, 12V or 110V AC.
A tank compressor is a different tool. The Metabo HPT and King Canada descriptions list tank sizes (1 and 3 gallons) and pressure or air delivery figures. If you plan to run an air tool, compare the tool’s air requirement in its manual with the compressor’s air delivery. The King Canada description lists 1.0 SCFM at 40 PSI and 0.60 SCFM at 90 PSI. The Metabo HPT description lists 59 dB, which is the number to look at if the garage is attached to the house.
How often should you check your tire pressure?
Transport Canada says to measure all tire pressures, including the spare, at least once a month, and to do it when the tires are cold. It says tires count as cold after the vehicle has been parked for at least three hours or driven no more than 2 km. The right pressure is on the tire information label, usually on the edge of the driver’s door, the door post, the glove box or the fuel door. If you cannot find it, check the owner’s manual.
Cold weather matters here. Transport Canada says tires lose about 7 kPa (1 psi) for every 5°C drop in temperature, and about 14 kPa (2 psi) a month through the rubber itself. It also says a tire can be 20 percent under-inflated and still look fine, and that pocket gauges from automotive supply stores are generally more accurate than gas station air pumps.
Does the right pressure save fuel?
Natural Resources Canada says under-inflating a tire by 56 kPa (8 psi) can increase fuel consumption by up to 4 percent, and can reduce tire life by more than 10,000 km. Transport Canada adds that under-inflation means higher rolling resistance, more heat build-up and a risk of sudden failure. Checking monthly with your own inflator is the low-effort way to avoid that.
What should you look for in a tire inflator or compressor?
- The power source. The AstroAI plugs into a 12V car outlet. The DEWALT lists a 20V MAX battery, 12V DC or 110V AC, and the title says Tool Only. The King Canada description lists 110V at 2.5 amps.
- An automatic stop and a digital readout. The AstroAI and DEWALT descriptions both list them, so the unit stops at the pressure you set.
- A cool-down time. The AstroAI description says the unit shuts off after 15 minutes of continuous use and recommends 10 minutes of rest before you use it again.
- Tank size and air delivery. For a tank compressor, read the tank size and the SCFM figure at the pressure your tool needs.
- Noise. The Metabo HPT description lists 59 dB. Pick the quiet model if you work in an attached garage.
- Oil-free pumps. The Metabo HPT and King Canada descriptions both list oil-free pumps.
- Warranty. The AstroAI description lists 2 years and the Metabo HPT description lists 1 year. Check the others on the Amazon page.
Is it safe to clean with compressed air?
The Canadian Centre for Occupational Health and Safety (CCOHS) writes for workplaces, and its advice is a good rule at home too. It says compressed air should never be used to clean clothing or any part of the body, and that you should wear eye protection against flying particles and dust. For cleaning, it says to keep the air pressure at the nozzle below 10 psi (about 69 kPa). It also reports that both the pressure and the noise of compressed air can damage hearing, and suggests a low-noise nozzle. A tank compressor lists pressures far above 10 psi (the Metabo HPT lists 125 PSI), so do not point the hose at yourself or anyone else.
Hearing protection matters in the garage too. See our leaf blower guide for how to protect your hearing around loud tools.
Common questions
Where do I find the right tire pressure? Transport Canada says to use the manufacturer’s pressures on the tire information label, usually on the edge of the driver’s door, the door post, the glove box or the fuel door, or in the owner’s manual.
Why check tires cold? Transport Canada says tires are cold after the vehicle has been parked for at least three hours or driven no more than 2 km.
How long can a 12V inflator run? The AstroAI description says it auto shuts off after 15 minutes of continuous use and recommends a 10-minute cool-down. Check the cool-down advice on any other model you buy.
Do I need a tank compressor for tires? A tire inflator is made for tires. A tank compressor is the one to buy if you also want to run air tools, and the tank size and air delivery are the numbers to compare.
Before you buy
- Decide whether you need tires only or air tools too.
- Find the tire pressure on the label in your car and write it down.
- Check the power source: a 12V car outlet, a battery, or a wall outlet. If the DEWALT interests you, check that you have a 20V MAX battery, because the title says Tool Only.
- Compare tank size, air delivery and noise if you want a compressor.
- Put a pressure check on the calendar once a month, with cold tires.
Sources: Transport Canada, Inflating your tires; Natural Resources Canada, Fuel-efficient driving techniques; CCOHS, Cleaning with Compressed Air. Product details come from the Amazon descriptions of the four products, so check the current description before you order.
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