a hub 10 of a wind turbine the bearing comprises a first bearing shell 1 and a second bearing shell 2 the second bearing shell 2 is attached to the hub 10 of the wind turbine the second bearing shell 2 is rotating together with the hub 10 of the wind turbine and is therefore the rotatable part of the bearing the first bearing shell 1 is attached to the stationary part of the wind turbine not shown and is therefore the stationary part of the bearing a number of bearing pads 3 is arranged between the first bearing shell 1 and the second bearing shell 2 the first bearing shell 1 comprises an opening 4 the bearing pads 3 are visible through the opening 4 the position of the opening 4 is in a place with a good accessibility during service of the wind turbine for example the position of the opening 4 can also be chosen to be in an area along the bearing where the loads present in the bearing are low the bearing pads 3 are visible through the opening 4 and can also be exchanged through the opening 4 the bearing pads 3 are detachably attached to the second bearing shell 2 the rotatable part of the bearing the.