How do aircraft tyres straighten themselves when landing in a crosswind?
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When the aircraft is airborne in a cross wind, the plane is facing slightly off it’s travelled path so the the sum of forces acting on the plane pushes it in the direction it wants to go (Thrust from the engines, wind, push from control surfaces – ailerons, rudder etc). Once the plane touches the ground, the drag force from the rolling resistance one the wheels and braking once engaged starts to dominate. The wheels are much more able to resist lateral forces from the wind as they can act on the ground whereas the plane in the air has nothing to push against but you still have to control the plane to keep it from being pushed around.
All that said, the wheels don’t really push the plane to straight – the pilot uses the control surfaces to straighten the plane (I never finished learning to fly but [this page](https://www.boldmethod.com/learn-to-fly/maneuvers/how-to-make-a-perfect-crosswind-landing-every-time-touchdown/) goes over some of the ways you can land in a cross wind in fairly simple terms)
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