DH Casters W-PN Light/Medium Duty Ribbed Pneumatic Wheel, 8 in Dia X 2-1/2 in W, 310 lb

Hi, there! Thank you for your query concerning the DH Casters W-PN08250RC pneumatic wheel. This wheel comes with a wheel size of 8", a thread width of 2-1/2", and a bearing size of 5/8". Unfortunately, we don't carry other 8" pneumatic wheels that have a bearing size of 20mm. However, if you could provide us with the make and model of your DH Casters handtruck, we could provide you with the correct replacement pneumatic wheels you need. Once you have the model number ready, kindly contact our customer support specialists at 435-868-4020 between 8:00 AM and 7:00 PM MST or through support@plumbersstock.com. They will be happy to assist you further. Thank you for choosing PlumbersStock! Have a great day!