They sell a small tub of stuff in the auto parts store it is called wheel bearing grease. Sometimes labeled "Disk Brake Wheel Bearing Grease" . Even the most expensive wheel bearing grease is not very expensive. They have the same stuff in motorcycle stores. I think White Lube works but I use Wheel Bearing Grease. I have spoke wheels so I can't tell you much about taking the bearings out of those wheels you have. It is best to take the bearing out to clean and grease them. On my spoke wheels I have a special tool to take the large nut off that holds the bearings in place. The bearing races can stay in place on the front wheel but on the rear wheel you probably have to remove the races because you can't get the bearing out with out doing this. I use a torch.