Objects in equilibrium (ie no net forces) continue to go in the direction and speed they were already heading. Forces are only needed to change direction.
If the bike/rider was going round the bend but started to drift out/up the track wouldn’t that be a change in direction?
Direction is always a straight line, so to go round a corner you need to be applying a continuous force resisting going in a straight line. If you start drifting wide it means the net size of that force has reduced.
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