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Hello, sir. I just bought a Toyota Vios, but the left front tire seemed soft so I added more air. The user manual says tire pressure should be 33psi up front and 30psi at the rear. I had them all checked and some were at 38psi, so I reduced them to standard. But how come the wheels still look soft? Should I add a little more air or should I maintain the tire pressure specified in the user manual?

Thank you!

Toyota Vios owner

 

Hi Vios owner,

The short answer to your question is, yes, you should follow the manufacturer's recommended tire pressures with the OE tires.

Most people will visually perceive almost any passenger car tire to be low on air. The fact is, very few people can tell just by looking at the sidewall of a vehicle's tire how much air it has. Even seasoned mechanics won't be able to easily tell without the use of a tire gauge.

Generally, the way a tire looks when it is inflated within 5psi of the manufacturer's recommended tire pressure looks no different to one that is properly inflated. No amount of wishful thinking will change that fact.

Any given tire will have a certain load rating for a given amount of air in it. If you've read the owner's manual or the tire label on the driver door jamb, you should've have noticed that there is a different set of recommended tire pressures when the car is fully laden and when it is carrying only a couple of passengers. The recommended tire pressures for the given sizes outlined in the owner's manual will be the best possible for most driving conditions and motorists.

Some car enthusiasts may choose to play around with tire pressures by deviating from the manufacturer's recommended levels by adding or reducing the amount in order to achieve their own ends. Be aware that when you do that, it is at your own risk as altering tire pressures will affect load capacity, tire traction, braking distances, and handling. Should you decide that you want to do this, buying a quality tire gauge to monitor your tire pressure is a must. The brand or type doesn't really matter as long as it will always read consistently

Thanks for writing in.

 

Ferman Lao
Technical Editor
Wearing the hats of a race car driver, driving instructor, grease monkey, tuner, dyno operator, auto shop owner, motoring journalist and CAGI president at one time or another, or all at once, deep down he's just another guy who loves cars.
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