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Summerwolf: define when "before they NEED" then. After all, for many tires grip might be noticeably reduced even if wear is just of 1/3rd vs that of new. For some low threadwear track tires maybe also heat-cycle count may play a role. To each his own, but there might be some that wish no-compromise best performance and be more anal on tire state not waiting for them to wear to "legal thread depth" levels (which often are rather lax)
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