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As Go4long mentioned, the MotoGP bikes can generally lean farther than bikes in other circuit racing series.
This is due to a number of things, the rider skills at this level being the most obvious. Besides that, the circuit surfaces at the majority of MotoGP events are of much higher quality than most other tracks. The more uniformly flat, smooth and "grippy" the track, the more steep the lean angles the riders can achieve.
For example, riders at the Isle of Man TT races don't lean as much as MotoGP circuit riders, simply because the track surface at the TT is nowhere near as "billiard table smooth" as the better MotoGP circuits. Unless the entire entry, apex area and exit is equally smooth, you don't want to do much full-on knee dragging in most corners.
Other important "heavy leaning" components are chassis geometry, suspension and tires; ... especially tires, since a single MotoGP tire can contain a number of different tire compound formulas, on different areas of the tires, depending on the track, length or race, temperature, and so on. One side of the tire might have one type of compound where the steepest lean angle contact occurs, and a slightly different compound next to it, and another for the "straight ahead drive" area, and often have a totally different combination on the opposite side of the tire, all depending on the layout of that particular track. A tire for tracks with more right than left turns might be completely differently designed than one with more left turns, and so on.
The rubber compounds used on these specialized tires will actually deform and conform to the tiny bumps and crevices of the track surface, but only when they reach a certain temperature and remain inside their working temperature limits, all very different than normal street tires.
WAY too much information.
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