Abstract: A wheel and bearing assembly, adapted for use in a packer wheel of an apparatus for delivering agricultural material, such as a planter has a plastic or synthetic hub. To install a bearing in the hub without exceeding the strength of the hub material, the bearing is pressed into a mounting insert made of metal or other high strength material. The insert has a non-circular outer surface and is placed into a complementary shaped cavity in the hub thereby preventing the insert and the bearing outer race from rotating relative to the hub. The fitting between the insert and the hub need only be tight enough to hold the insert in place during handling.