John M.
They are 1/2 inch bolts. I just use carriage bolts so I don't have to hold up the weight and use 2 wrenches to tighten. The bolt length depends on your rim width. Measure from the weight bolt holes on the rim outward to about where the edge of the weight would be. Might be best to have weight and another set of hands to hold in place while you measure. I have gotten little longer and just cut off extra.
They are 1/2 inch bolts. I just use carriage bolts so I don't have to hold up the weight and use 2 wrenches to tighten. The bolt length depends on your rim width. Measure from the weight bolt holes on the rim outward to about where the edge of the weight would be. Might be best to have weight and another set of hands to hold in place while you measure. I have gotten little longer and just cut off extra.