Quote:
Originally Posted by JSH
I used to work with a guy that previously worked for Michelin for more than a decade working on commercial tires. According to him a commercial tire can be used 9 times:
1. The original tread
2. Face on a lathe and groove
3. Face on a lathe and groove
4. 1st Retread
5. Face on a lathe and groove
6. Face on a lathe and groove
7. 2nd Retread
8. Face on a lathe and groove
9. Face on a lathe and groove
For each regroove or retread a mark is burned on the side of the tire. According to him retreads aren't a problem if they are done right. They fail for the same reason that original tires fail - overheating due to underinflation.
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Except prime tires don't puke up their tread when they overheat...
Seems dangerous and common enough that retreads come apart that there should be pressure and temperature monitoring on them. Makes no sense to have pressure monitoring on passenger cars because they only have 4 wheels, and it's plainly obvious when the tires are dangerously low due to handling differences.
Just yesterday a guy had pulled halfway onto the shoulder and stopped on a country road (55 MPH limit). I was angry that he was backing up traffic and creating a dangerous situation, but then realized he was pulling half a tire carcass off the road, which if hit, would have caused major damage for most passenger cars.