Manually adjustable wheels

A manually adjustable wheel for a vehicle, e.g., a tractor, comprising:

• a rim to receive a tyre;
• a plurality of channel-shaped fixing lugs spaced apart around the radially inner periphery of the rim, the lugs being arranged in pairs with the circumferential spacing between the lugs of each pair being less than the circumferential spacing between adjacent lugs of adjacent pairs, the lugs having flanges which overlie, and are welded to, the rim thus fixedly to secure the lugs to the rim;
• a disc of uniform thickness for connection to a hub of the vehicle;
• the disc having substantially the shape of a square with the corners cut off so that the disc has an irregular octagonal shape having four longer sides and four shorter sides arranged alternately around the periphery of the octagon and with each shorter side being juxtaposed against a pair of lugs;
• and
• bolt means detachably securing the disc to the lugs, the disc and lugs being arranged so that the disc may be selectively secured to the lugs in either of two positions, the bolt means being located along the shorter sides of the disc only and, at each of said shorter sides comprising two bolts with each bolt passing through the disc and through one of the lugs of a pair of lugs juxtaposed to said shorter side.