To be fair to pedants...
I've been told several times that I use the word 'momentum' incorrectly in this context, and that I should refer to 'negative inertia'.
Perhaps it's me being the pedant!
As the plane gets more and more speed, running on the runway, the force with which the wheels press on the ground decreases and less and less thrust is available.
So long as the wings are held at an angle of attack that produces 0 lift during the acceleration to above flight speed, the weight on the wheels will remain constant, until 'rotation'.
MJ
