Quote: "This is fearmongering and I don't buy it. If it is vital for new tyres (sic) to be installed on the rear axle, then why is this not specified in my owner's manuals? Why do car manufacturers and tire manufacturers not address the perils of eventual rotation of new tires from the back to the front? Rear tires can wear very slowly and can be like new at the expected 6000 to 8000 mile rotation mileage."
There are 2 points worthy of addressing:
1) Owners manuals specify you are supposed to rotate your tires on a regular basis. If you do that, you will not encounter the situation where you have tires of drastically different tread depths. To address an issue that can not happen if the original instructions are followed seems to imply that it is OK NOT to follow the original instructions.
2) Why don't tire and car manufacturers address the eventual rotation problems? Because there isn't one. If the rule is to have the best tires on the rear - then the "new" tires shouldn't be on the front.
But this scenario is predicated on a false premise: That NOT following the rules about rotation is OK to begin with - and that suddenly changing that to following the rules puts one back on the right path.
No! I'm sorry, but if one didn't follow the rotation instructions, and got different wear rates, then one can't blame someone else extracting them from the problem.
But you have a point. There probably should be instructions - and it would not be fearmongering to remind folks to do the safe thing. On the other hand, owners manuals are pretty thick now and most folks never open them! I'll bet it would triple in size if instructions were added to cover "non-compliant situations".