Tire pressure? - Toyota Yaris Forums

YarisSedan · 12-22-2008, 03:58 PM

Here are some reputible, reliable sources of information that will tell you all you would ever want and need to know about tires and tire pressure to put this post to rest. If the quotes interest you click on the link to read the complete articles

http://www.betiresmart.ca/resources/...oc2=faqs#faq03
"Is over-inflation harmful?
Yes. One of the biggest tire maintenance-related myths is that over-inflation is not a problem. Often, even people who understand that under-inflation is a problem are unaware of the harmful effects of over-inflation.

An over-inflated tire rides on just the centre portion of the tread. The smaller contact area means reduced grip on the road leading to a harsh ride, handling issues (such as steering and stopping problems) and increased wear on tires and suspension components.

What should I do if my tires are over-inflated?
If you find that your tires are over-inflated, release air by pushing on the metal stem in the center of the valve, then re-measure the pressure. Never reduce pressure when tires are hot. Wait until they are cold, meaning that your vehicle has been stationary for at least 3 hours or has not been driven more than 2 km."

http://www.popularmechanics.com/blog...s/4199963.html

"Debunking a Mileage Myth: Can You Really "Pump Up" Your Fuel ..."

http://www.tirestamp.com/index.php?o...139&Itemid=177

"Question: Is my tread wear effected by overinflation?

Answer: Overinflation is almost as bad as underinflation. Overinflation is any pressure that exceeds the pressure needed to carry the load by 10% or more. Just as with underinflation, overinflation changes the footprint too. The contact patch actually becomes shorter and narrower. This results in the shoulders of the tire scuffing along while only the center of the tire makes full contact with the road which leads to irregular wear patterns and lost tread mileage. Center rib wear, flaking, chunking, erratic depression wear are commonly observed conditions in addition to overall rapid tread wear. A tire that is overinflated by 20% will lose 10% of its tread mileage. In addition, traction is negatively impacted since the contact patch is much smaller than is optimal. The ride is harsher since the sidewall is much stiffer and handling is different since the footprint has changed. Vehicle suspension and steering system components are also affected by the harsher ride and handling due to over inflation. Overinflated tires are also prone to cuts and snags, impact breaks, and sidewall and crown penetrations affect a vehicle’s handling. "

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12-22-2008, 03:58 PM	#19
YarisSedan Drives: 08 Yaris Sedan Join Date: Oct 2008 Location: California - Bay Area Posts: 2,773	Here are some reputible, reliable sources of information that will tell you all you would ever want and need to know about tires and tire pressure to put this post to rest. If the quotes interest you click on the link to read the complete articles http://www.betiresmart.ca/resources/...oc2=faqs#faq03 "Is over-inflation harmful? Yes. One of the biggest tire maintenance-related myths is that over-inflation is not a problem. Often, even people who understand that under-inflation is a problem are unaware of the harmful effects of over-inflation. An over-inflated tire rides on just the centre portion of the tread. The smaller contact area means reduced grip on the road leading to a harsh ride, handling issues (such as steering and stopping problems) and increased wear on tires and suspension components. What should I do if my tires are over-inflated? If you find that your tires are over-inflated, release air by pushing on the metal stem in the center of the valve, then re-measure the pressure. Never reduce pressure when tires are hot. Wait until they are cold, meaning that your vehicle has been stationary for at least 3 hours or has not been driven more than 2 km." http://www.popularmechanics.com/blog...s/4199963.html "Debunking a Mileage Myth: Can You Really "Pump Up" Your Fuel ..." http://www.tirestamp.com/index.php?o...139&Itemid=177 "Question: Is my tread wear effected by overinflation? Answer: Overinflation is almost as bad as underinflation. Overinflation is any pressure that exceeds the pressure needed to carry the load by 10% or more. Just as with underinflation, overinflation changes the footprint too. The contact patch actually becomes shorter and narrower. This results in the shoulders of the tire scuffing along while only the center of the tire makes full contact with the road which leads to irregular wear patterns and lost tread mileage. Center rib wear, flaking, chunking, erratic depression wear are commonly observed conditions in addition to overall rapid tread wear. A tire that is overinflated by 20% will lose 10% of its tread mileage. In addition, traction is negatively impacted since the contact patch is much smaller than is optimal. The ride is harsher since the sidewall is much stiffer and handling is different since the footprint has changed. Vehicle suspension and steering system components are also affected by the harsher ride and handling due to over inflation. Overinflated tires are also prone to cuts and snags, impact breaks, and sidewall and crown penetrations affect a vehicle’s handling. "