Quote:
Originally Posted by Eddles
I live in England. All tires has pressure information on the sidewall, but always with a label saying "US and Canada only". Never any maximum pressure information for anywhere outside the US or Canada. Why is this?
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This is likely the difference in regulations. In the US, the information is required on the sidewall. I'll bet the UK regulations do not require it - and perhaps specifically indicate that it is not allowed - and the work around is to say that this only applies to US and Canada?
Quote:
Originally Posted by Eddles
..... And how do I figure the max pressure to use for a tire? Reason I ask, on my new car, it has 3 different tires, 2 specifies a max pressure of 51 PSI, 1 specify a max pressure of 44 PSI, and 1 specify a max pressure of 36 PSI, but all with "US and Canada only" on. Does this mean it's safe for me to go to 50 PSI, even on a 36 PSI rated tire? Or should I follow the "US and Canada only" info?
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Your new car has 3 different tires on it? I assume that's because it is not a "NEW" car, but a used car that is new to you.
Quote:
Originally Posted by Eddles
........(As a related note, my car manual unusually recommends a pressure of 46 PSI for the front, and 39 PSI for the rear for my model (ECO4) - but for all other models, around 25 PSI is recommended. Anyway, imagine someone who has the car, that person doesn't look at sidewalls, and 46 PSI put in the 36 PSI rated tire...)
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You didn't tell us what make the car is and the model doesn't translate into a model that I recognize in the US. Perhaps we know it as a different name?
You should be aware that there are different regulations around the world. Plus, people in different countries can have quite different desires, so even the same make and model may come with quite different tires.
What may be going on here is that the ECO4 uses a smaller tire, but in an Extra Load, than the other models. That would explain the difference in pressure specification.
Perhaps it would be good to read up on how tire size / inflation pressure / load carrying capacity are related:
http://www.geocities.com/barrystiretech/loadtables.html
Armed with that information, you should draw the conclusion that regardless of what is imprinted on the sidewall of a tire, if it is a Standard Load Passenger Car tire, then the rated inflation pressure is 35 psi (or 36 psi if your use the metric version of the tire standards) If the inflation pressure indicated on the sidewall is different than that - specifically 44 psi or 51 psi - then that imprinted pressure is the maximum ALLOWABLE pressure. But if the maximum pressure imprinted on the sidewall is 41 psi or 50 psi, then the tire is an XL. (Light Truck tires or Commercial tires are different and so are the rules.)
What this means in your case is that even though the tires have different maximum inflation pressures they are designed around the same inflation pressure / load carrying relationship (more or less).
You should spend a little time looking at the tire size, the load index and speed ratings for each of the tires involved. I'll bet you're going to have quite a collection of differences. If, for example, you have a V speed rating mixed in with a group of S or T rated tires (and it seems you do), then the V rated tire is going to react quite differently to changes in inflation pressure than the S or T rated tire.
So after you've collected that information, why don't you post it so we can see the entire picture? Plus it would be helpful to identify the car and the sizes as indicated above.
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