A gyratory crusher outer crushing shell mountable within a region of a topshell of a gyratory crusher and extending around a longitudinal axis, the crushing shell comprising: a mount face being outward facing relative to the axis for positioning opposed to a least a part of the topshell and a crushing face being inward facing relative to the axis to contact material to be crushed, a wall defined by and extending radially between the mount surface and the crushing surface, the wall having a first upper axial end and a second lower axial end; a raised first contact region positioned axially towards the first upper axial end and extending radially outward at the mount surface and in a direction around the axis, the contact region having a radially outward facing raised first contact surface for positioning opposed to a radially inward facing surface of the topshell or an intermediate spacer ring; a raised second contact region positioned axially towards the second lower axial end and extending radially outward at the mount surface in a direction around the axis, the second contact region having a radially outward facing raised second contact surface for positioning opposed to a radially inward facing surface of the topshell; characterised by: a ledge or groove provided at the mount face side of the wall at a position of the raised first contact region or axially between the first upper axial end and the raised first contact region, the ledge or groove providing an abutment face to seat a sealing ring positionable between the mount surface and the topshell or spacer ring, a radial length of the abutment face being less than a radial thickness of the wall at the region between the first upper axial end and the raised first contact region. a mount face being outward facing relative to the axis for positioning opposed to a least a part of the topshell and a crushing face being inward facing relative to the axis to contact material to be crushed, a wall defined by and extending radially between the mount surface and the crushing surface, the wall having a first upper axial end and a second lower axial end; a raised first contact region positioned axially towards the first upper axial end and extending radially outward at the mount surface and in a direction around the axis, the contact region having a radially outward facing raised first contact surface for positioning opposed to a radially inward facing surface of the topshell or an intermediate spacer ring; a raised second contact region positioned axially towards the second lower axial end and extending radially outward at the mount surface in a direction around the axis, the second contact region having a radially outward facing raised second contact surface for positioning opposed to a radially inward facing surface of the topshell; characterised by: a ledge or groove provided at the mount face side of the wall at a position of the raised first contact region or axially between the first upper axial end and the raised first contact region, the ledge or groove providing an abutment face to seat a sealing ring positionable between the mount surface and the topshell or spacer ring, a radial length of the abutment face being less than a radial thickness of the wall at the region between the first upper axial end and the raised first contact region. a ledge or groove provided at the mount face side of the wall at a position of the raised first contact region or axially between the first upper axial end and the raised first contact region, the ledge or groove providing an abutment face to seat a sealing ring positionable between the mount surface and the topshell or spacer ring, a radial length of the abutment face being less than a radial thickness of the wall at the region between the first upper axial end and the raised first contact region.