I was wondering if you could tell me which grease is suitable for use in automotive hub bearings. The car is an FD3S and is used for street driving and a few times a year for circuit driving.

The recommended grease is LS Bell Hammer Grease No.2 or LS Bell Hammer Gold Grease No.2.
Both of these greases are considerably softer than normal greases, but many tuning stores actually use them.
LS Bell Hammer is also sufficient, but LS Bell Hammer Gold contains twice the amount of friction-reducing agents as regular LS Bell Hammer, so the friction-reducing effect is more effective.