I believe that there is something about the 777-300ER gear tilt as well. The earlier 777's had main gear that tilted and the tilt of course started to happen as soon as the aircraft was rotated. So just prior to liftoff, the aircraft would be at say 9 or 10 degrees nose up with all of the main gear wheels still rolling on the runway.
But with the 777-300ER, there is something called the semi-lever gear where somehow, it is designed so that there is no tilt during the rotation. So when the aircraft is in the same 9 or 10 degree rotation attitude, only the aft two wheels for each bogie are still on the ground. Somehow this allows a slightly greater tail clearance because the pivot point of rotation has been moved slightly aft allowing the aircraft to be rotated to a slightly higher pitch attitude. which gives better takeoff performance due to the higher AOA achievable on the ground.
Or so I heard anyways.