Adding weight to tractor wheels is often important, particularly when operating non-powered attachments. Better traction improves performance and safety. Wheel Weights are required to operate the Moldboard (Bottom) Plows, Root Digger, and other applications in which the tractor weight is insufficient to perform the intended application of the attachment. There are three Wheel Weight options based on wheel size: add 48 pounds to 8" wheels (standard wheel size for models 620, 710 and 718) add 66 pounds to 10'' wheels (standard on models 722 - 749) add 150 pounds to 12'' wheels (standard on model 750) 150-pound Wheel Weights and 12'' wheels are recommended to operate the Moldboard Plows. We recommend Wheel Extensions be installed for Wheel Weights.