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.