GW209PPB11 Heavy Duty Agricultural Disc Harrow Bearing - 1.78" Round BoreGW209PPB11 Heavy Duty Agricultural Disc Harrow Bearing 1. 78" Round Bore Triple Lip Seals Re Lube Ready The GW209PPB11 is a field tough bearing built for use in John Deere 210, 220, and 230 non Dura Flex disc harrows and similar ag machinery. With a 1. 78" round bore and curved OD, it installs smoothly into your disc frame while holding up to the harshest field abuse. What sets this bearing apart is its triple lip seal design a one piece molded shroud