Quote:
Originally Posted by CapriRacer
2 thoughts:
1) While there is some data on the affect higher inflation pressures has on fuel economy, there is little data on the other affects - traction, wear, ride, failures, etc. The only thing we have is anecdotal data.
A caveat - No data is no data. Lack of data is neither a positive nor a negative. It is, however, a reason to be cautious.
2) Does anyone know where the maximum pressures listed on the sidewall of tires comes from?
No, testing is NOT the correct answer. Please note that there is a pattern to the pressures and part of the question I am asking has to do with why there is a pattern.
- OR -
Why the static burst pressure is so high compared to the recommended inflation pressures?
And don't say "over-design" or "safety factor". The question is "why design something with apparently so much excess strength?"
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Also,
3) Assuming higher PSI = better FE, why do most auto makers choose a door sticker PSI number approximately 30% less of max sidewall pressure. If tires are designed to handle 200 PSI, wouldn't raising the pressure be the first place they go to help their cars achieve CAFE standards?
And don't say "it's a conspiracy".