ATIS is quite widespread in Brazil for heavy-duty commercial vehicles, yet it's often fitted in a different way with some pipes hanging more visibly on the outside. It's easier to notice on the front axles of the trucks in these pictures.
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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
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But these tyres are regroovable as a design feature, while for tyres meant to light-duty vehicles it's not the case. Yet it's quite a common practice. A friend who opened a tyre shop after we finished high-school told me it was widely sought after.
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For each regroove or retread a mark is burned on the side of the tire.
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I'm sure most tyre repairers in my country "forget" this procedure.