Hello,

Picked up a old Schwinn Frontier GS mountain bike at a yard sale last weekend and was working to get it all lubed up. The bottom bracket is pretty stiff and feel like the bearings need some help... google seems to show there are multiple types of the square style bottom bracket and before I mess something up I figure I would ask what the proper method is to disassemble.

Can the bearings be greased in these or do I need a whole new unit? Thanks!