So when fixed cup replacement becomes necessary, visit a pro mechanic. If you want to work on a bike with a sealed bottom bracket cartridge, you may have to buy tools made for the unit. Inquire at a bike shop. Freewheel remover . There are no universal tools in this department.
Every freewheel manufacturer makes a remover with unique dimensions.
The freewheel must be removed for servicing the rear hub and replacing spokes. Buy one remover for each brand of freewheel you plan to encounter. Spoke wrench . Tire levers . There's nothing better than tire levers for removing clincher tires.