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Author Topic:   What does P225/70R15 mean
posted September 18, 2002 11:09 PM           Edit/Delete Message Reply w/Quote
How do you decode the numbers and letters on the side of the tires? The only thing I know is that the 15 is the size of the rim. What are the other numbers/letters?

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posted September 19, 2002 07:33 AM           Edit/Delete Message Reply w/Quote
I forget what numbers you gave but on a 225/50/15...225 in the tire width in mm (225 mm) 50 is the high in % of the width (or 112 mm high)......as you said 15 is the rim

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posted September 21, 2002 06:01 AM     Click Here to See the Profile for CapriRacer     Edit/Delete Message Reply w/Quote
What this also means that there is a relationship between the inflation pressure and the load carrying capacity - the maximums are printed on the sidewall of the tire.

Look for the placard on your vehicle. The placard, among many things, tells the original tire size, the original wheel size, and the proper inflation pressure for that tire size on that vehicle. The placard is usually located on a doorpost or in the glove box. I like to use 3 to 5 psi above the placard. I get better fuel economy, better tire wear, better wet traction, better snow traction, better steering response, better tire durability, and only give up a bit of ride harshness.

"They" say you should check your tire pressures once a month. Don't trust the guys at the shop to do it. These guys are paid by the hour and this is one of the easiest things to shortcut. Besides, there are a lot of mechanics you don't know where to look for the proper inflation. No, it is not on the sidewall.

Buy yourself a tire gauge - a $5.00 pencil gauge works just fine, but I prefer the pistol grip digitals because they are remarkably accurate. The check takes all of 5 minutes and it is the cheapest safety check you can make.

Hope this helps.

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