The tyre looks the same as it did when you parked. It is not the rubber you had at the end of yesterday's ride. It sat all night at the temperature of the air, and the first mile is the mile where it has not warmed through. A bend you took easily yesterday afternoon asks for less lean, and less brake, until that rubber has worked.
What the cold changes
Grip comes up with the temperature in the tyre, not with how the bike looks in the garage. A short ride to get coffee can be over before the tyre is there. The front is the one that tucks if you tip in as if the afternoon were still in the rubber. The rear spins if you leave a junction on a painted line with the throttle you used when everything was warm.
Use the first mile as the warm-up
Leave gently. Brake earlier than you think you need, in a straight line, and keep the first corners shallow. Stay off paint, a metal cover, and a damp patch until you have felt the tyre take an ordinary stop. If the morning is near freezing, that gentle mile is longer. The tyre you can trust is the one you have already used today, not the one you remember from last night.
Pressure is a separate check
Cold air also drops the gauge reading. Set the pressure when the tyre is cold, to the number for that bike, not to the number you saw after a hot ride. A tyre that is low and cold is two problems. Set the pressure before you use the first mile to warm it.
