Checking your vehicle’s tyre pressure regularly is a critical aspect of maintaining your car and ensuring your safety on the road. Properly inflated tyres not only contribute to better fuel economy but also help prevent accidents and extend the life of your tyres. While a tyre pressure gauge is the most accurate tool for checking pressure, there are several methods you can use to check tyre pressure without a gauge.
Why Checking Tyre Pressure is Important
Safety Concerns
Driving with underinflated tyres can be extremely dangerous. Low tyre pressure affects your vehicle’s handling and stability, increasing the risk of accidents, especially in adverse weather conditions or during sudden maneuvers. Underinflated tyres are more prone to blowouts, which can cause you to lose control of your vehicle.
Impact on Fuel Economy
Proper tyre pressure also plays a significant role in your vehicle’s fuel efficiency. Underinflated tyres create more rolling resistance, meaning your engine has to work harder to maintain speed, consuming more fuel in the process. By keeping your tyres properly inflated, you can improve your gas mileage and save money at the pump.
Tire Longevity
In addition to safety and fuel economy, proper tyre pressure also affects the longevity of your tyres. Underinflated tyres wear out more quickly and unevenly, leading to premature tyre replacement. By maintaining the recommended pressure, you can extend the life of your tyres and avoid the cost of early replacements.
Methods to Check Tyre Pressure Without a Gauge
While a tyre pressure gauge is the most accurate way to check your tyre pressure, there are several methods you can use to estimate your tyre pressure without one:
Thumb Check
The thumb check is a quick and easy way to estimate your tyre pressure. Press your thumb firmly against the sidewall of the tyre. If the tyre feels soft and gives easily, it is likely underinflated. A properly inflated tyre should feel firm and resist pressure.
Mass Over Wheels Check
Another way to check tyre pressure is to observe how the tyre responds to the weight of your vehicle. Stand back and look at your car from the side. If the tyre appears to bulge out at the bottom where it meets the road, it may be underinflated. A properly inflated tyre should maintain its shape under the weight of the vehicle.
Trail Comparison Check
You can also check your tyre pressure by comparing the trails your tyres leave on a dusty or sandy surface. Drive your car slowly on a flat surface, then stop and observe the tracks left by your tyres. An underinflated tyre will leave a wider, flatter track, while a properly inflated tyre will leave a thinner, more defined track.
Cargo Check
If you suspect one of your tyres may be low, try placing a heavy object (like a toolbox or spare tyre) over that wheel. If the tyre noticeably squishes down under the added weight, it is likely underinflated. A properly inflated tyre should remain firm and support the extra load.
Hand Pressure Check
Similar to the thumb check, you can use your entire hand to estimate tyre pressure. Place your hand on top of the tyre and press down with your palm. An underinflated tyre will feel soft and give under pressure, while a properly inflated tyre will feel firm and resist your hand.
Eye Observation Check
Finally, you can visually inspect your tyres for signs of low pressure. Look for any bulges, especially on the sidewall near the rim. If you notice a bulge larger than about 10mm, your tyre is likely significantly underinflated. However, keep in mind that some bulging is normal, especially on larger tyres or those with a high load capacity.
When to Check Tyre Pressure
Regular Checks
Experts recommend checking your tyre pressure at least once a month as part of your regular vehicle maintenance routine. Set a reminder on your phone or mark it on your calendar to check your tyre pressure on the first day of each month.
- Check pressure when tyres are “cold” – before driving or after the car has been parked for a few hours
- Refer to your vehicle’s owner’s manual or the sticker inside the driver’s side door jamb for the recommended tyre pressure
- Don’t forget to check the spare tyre as well
Before Long Drives
It’s especially important to check your tyre pressure before embarking on a long road trip. Properly inflated tyres will give you better fuel economy, a smoother ride, and reduce the risk of a flat or blowout far from home. Take a few minutes to check your pressure and adjust as needed before hitting the highway.
What to Do If You Suspect Low Tyre Pressure
Visit a Tire Shop
If you’ve used one of the above methods and suspect that one or more of your tyres may be underinflated, it’s best to have them professionally checked as soon as possible. Visit your local tyre shop or service station and ask them to check and adjust your tyre pressure. Most will do this for free or for a nominal charge.
Use a Gauge for Accurate Measurement
While the methods described above can help you estimate your tyre pressure, they are no substitute for an accurate tyre pressure gauge. Consider keeping a small, inexpensive digital or dial gauge in your glovebox. Check your pressure monthly and before long trips, and adjust as needed to keep your tyres properly inflated.
