asymmetric drop centre type having a well 17 a bead seat 18 a second bead seat 19 and a generally cylindrical ledge 20 tyre retaining flanges 21 are located at the axially outer ends of the bead seats the rim is formed from strip material of uniform thickness in a manner known per se the transition between the ledge 20 and the bead seat 19 is indicated at 23 and an adapter band 24 is welded to the rim adjacent to the said transition the adapter band is welded to the rim in the position described in continuation in part application ser no 962 345 filed nov 20 1978 by michael frederick edwards and john dickson mabon assigned to gkn sankey limited the assignee of the subject application the band 24 is also made from strip material of uniform thickness which is circled welded and then deformed to the shape shown the band has a cylindrical portion 25 and a divergent portion 26 internally of the divergent portion 26 is a machined frusto conical surface 27 which merges with a machined internal cylindrical surface 28 within the portion 25 these surfaces 27 and 28 are machined about the rotary axis 12 of the assembly after the adapter band has been welded to the rim so that the truth of the surfaces is not.