Why is the tread depth for new tires set at 10/32″? Why can’t it be 20/32″ for example to last much longer? eli5
In: 113
Others have commented that deeper threads may result in more flex. But additional flex by itself isn’t necessarily a problem.
**The real issue is heat.**
Basically when tires flex, there’s internal friction that generates heat. If there’s too much flexing then the tires get hotter and hotter as we drive long distances — to the point that the rubber compound can start to melt and the tire’s structural integrity gets compromised.
Incidentally, a tire that’s low on air pressure will also flex too much and can similarly fail due to overheating. Hence maintaining the proper air pressure is very important for safety.
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