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Summer tires start getting noticeably harder at 50 degrees or so. At 40 degrees they can loose traction fairly easily on dry pavement (acceleration and especially braking). Below freezing they're very hard and very slick. Preventing tire lock up under heavy braking becomes a serious concern/challenge. Traction in wet conditions (not even considering ice or snow effects) is almost non existent when the tread compounds get that hard.
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