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The tire talk started because of the talk about the difference in embodied energy. Initially it's pretty big, but as the miles rack up and a motorcycle goes through more tires the gap closes. An 80mpg bike does have half the carbon emissions of a 40mpg car, and it also tends to have similar or greater emissions aside from carbon.
On the subject of tires, I can see a dealership cutting corners and going with el cheapo tires, but plenty of tires in the U.S. come with 80k to 100k mile treadlife warranties and will last for that long, or less if the owners abuse them. I don't see any bike tires with 30k lifespans.
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