A gyratory crusher spider bushing assembly for positioning radially intermediate a topshell spider and a crusher main shaft configured for gyroscopic precession within a crusher, the assembly comprising: an annular main body extending around an axis of the assembly and having a radially outward facing surface for positioning opposed to the topshell spider and a radially inward facing surface (201, 203) for positioning opposed to the main shaft or a sleeve surrounding the main shaft, the main body formed from a first material; the main body comprising a first end having a mount flange extending radially outward and a second end intended to be positioned lowermost within the crusher relative to the first end; an annular wear collar positioned at the inward facing surface and extending radially inward from the main body to contact the main shaft or the sleeve; the collar mounted at the main body to prevent independent rotation of the collar about the axis relative to the main body; the collar comprises a second material having a wear resistance greater than the first material; and an axial length corresponding to a distance between a first end and a second end of the collar that is less than that 75% of an axial length the main body corresponding to a distance between the first end of the main body and a region of the main body aligned at the same axial position as the second end of the collar; the collar positioned axially closest to the second end of the main body relative to the first end of the main body; the inward facing surface (201, 203) and/or the collar comprises a radially extending abutment to axially separate and prevent the collar from moving axially towards the first end; characterised in that: the inward facing surface (201, 203) of the main body is aligned transverse to the axis of the assembly to tilt radially outward such that a radial separation distance of said inward facing surface (201, 203) at an axial position of the first end of the main body is more than a radial separation distance of said inward facing surface (201, 203) at an axial position at or towards the abutment. an annular main body extending around an axis of the assembly and having a radially outward facing surface for positioning opposed to the topshell spider and a radially inward facing surface (201, 203) for positioning opposed to the main shaft or a sleeve surrounding the main shaft, the main body formed from a first material; the main body comprising a first end having a mount flange extending radially outward and a second end intended to be positioned lowermost within the crusher relative to the first end; an annular wear collar positioned at the inward facing surface and extending radially inward from the main body to contact the main shaft or the sleeve; the collar mounted at the main body to prevent independent rotation of the collar about the axis relative to the main body; the collar comprises a second material having a wear resistance greater than the first material; and an axial length corresponding to a distance between a first end and a second end of the collar that is less than that 75% of an axial length the main body corresponding to a distance between the first end of the main body and a region of the main body aligned at the same axial position as the second end of the collar; the collar positioned axially closest to the second end of the main body relative to the first end of the main body; the inward facing surface (201, 203) and/or the collar comprises a radially extending abutment to axially separate and prevent the collar from moving axially towards the first end; characterised in that: the inward facing surface (201, 203) of the main body is aligned transverse to the axis of the assembly to tilt radially outward such that a radial separation distance of said inward facing surface (201, 203) at an axial position of the first end of the main body is more than a radial separation distance of said inward facing surface (201, 203) at an axial position at or towards the abutment. the inward facing surface (201, 203) of the main body is aligned transverse to the axis of the assembly to tilt radially outward such that a radial separation distance of said inward facing surface (201, 203) at an axial position of the first end of the main body is more than a radial separation distance of said inward facing surface (201, 203) at an axial position at or towards the abutment.