How To Properly Check and Fill Tires


While it may seem like a mundane task, inflating tires is much more crucial to your car than you may think, and it results in a safer and more economical experience on the road. Your vehicle's handling also will be greatly improved as the larger a tire's inflated footprint, the more responsive and comfier the ride balance will be.

Because it's National Tire Safety Week, it's the perfect time to check your car's tires.

Before starting

To find your tires' proper inflation level, look for a sticker on the driver-side doorjamb. It displays the vehicle weight restriction and tire information. The info is also found in the maintenance or car-care section of your vehicle’s owner's manual.

Don't refer to the sidewall markings on your tires, which in part specify the maximum tire pressure — not the recommended pressure.

Unless your tire is visibly flat, don't judge tire inflation just by looking at it; you have to use a tire pressure gauge to get the correct pounds per square inch reading. There are three types of tire-pressure gauges: digital, internal slide and dial. Prices range from $5 for a basic gauge to more than $30 for one that is digital, has an air-release button — or even talks. All will do the job, but you may want to consider the conditions in which you'll be using your gauge. "We've found that low-cost digital pressure gauges are very accurate and maintain the accuracy longer, but in extremely cold temperatures the gauge may not show up properly," said John Rastetter, Tire Rack's director of tire information services.

Tips for checking and filling your tires

Tire manufacturers suggest checking tires when they're cold for the most accurate reading. Outside temperatures can cause tire pressure to vary by as much as 1 psi per 10 degrees; higher temperatures mean higher psi readings. "Tires are black; what does black do? Attract heat," Rastetter said, noting the importance of finding a shady place to check and fill all four tires.

Temperature plays a huge part in tire psi, Rastetter said, adding that the most crucial time of year to check pressure is in fall and winter when days are shorter and average temperatures plummet.

Check your tires in the morning before going anywhere, because as soon as you get behind the wheel for an extended amount of time, psi will rise. Rastetter said that if you've been on the road a long time and notice higher psi in your tires, don't let the air out, as the increase in pressure has built up due to the warm, constantly-in-motion tires

What to do

1. Pull your car onto a level surface in the shade.
2. Remove dust caps from the tires' valve stems.
3. Using your tire gauge, firmly press the tip of the gauge straight on to the tire's valve stem for a brief moment.
4. The tire gauge should provide a psi reading; if the number seems unrealistically low or high — for example, 85 psi or 1 psi – you will need to repeat the previous step, ensuring that the tire gauge's tip is properly making contact with the valve stem.
5. If the tire gauge's recorded reading is higher than the manufacturer-recommended rating, press the gauge tip on the valve stem until you hear air leak out. Check the tire pressure again.
6. If the reading is lower than recommended, fill the tire with air by firmly pressing the air-hose tip onto the valve stem. You will hear air quietly enter the tire. If you hear air leaking or spraying out, you need to double-check that the connection between the air hose and the tire’s valve stem is secure.
7. When you think you've added or let out enough air, check the pressure a few times with the gauge.
8. Replace the valve dust caps. Rastetter emphasized the importance of keeping dust caps on during winter driving because if water gets into the valve stem and freezes inside the tire, it could cause a flat.

While you're at it, check your spare tire's pressure. You don't want to have a flat tire and then find out your replacement is flat, too.

Make these steps part of your routine. It will benefit your vehicle and your wallet.

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By Robby DeGraff | June 4, 2013 | Comments (4)


Tire pressure gets over looked so much. I've seen people drive with less than 15 psi in the front tires and not even notice. The steering gets heavier or pulls to one side. Hopefully the newer TPMS systems get people to stay on top of it.

This is great, though I have to get a digital reader now :)

The manual ones just don't cut it anymore.

Charlie Carey

You are passing some bad science:
If your tire pressure is increasing 1 psi for a 10 degree temperature increase then your original pressure was 53 psi, way too high for passenger cars.

"what does black do? Attract heat" No, no, no. Heat does not think or even comprehend, it isn't attracted to anything, ever.

Black is a better heat absorber than white, but it is a better heat radiator too. Tire makers make tires black for a good reason, to radiate away the heat which comes mostly from friction, not solar heating. Otherwise, the best tire would be white or silver.

TPMS measures the pressure all the time, not just early mornings, so why can't we? The placard pressures from manufacturers are minimums. Usually they are set for best mpg but not best steering, braking or tire life. Those pressure are higher. In autocross we run 40-45 psi for better control and we measure that right after the tire has been used, not cold.

Think about it: when does a tire need its pressure right? When does it wear, flex and roll? When it is being used. Set your pressures right after driving, not cold.

If you don't know how much air your tire can take, then you could be causing unnecessary trouble for your tires. most people think the tire pressure is on the wheel, but its not. where you can find it on newer model cars is on the driver side door frame. if your cars older then look in the owners manual. hope these tips help
_your friends at MDtiredepot.com_

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