Offset is the measurement from the center of the wheel to the mounting face where it mounts on the drum. The wheels you have now are probably around 4 1/2" offset. Measure how close your tires are to the spring hangers now and see if you would have room for 2 to 2 1/2" closer to the suspension. Some of the adaptors on eBay state for single wheels only. I would contact the seller and tell them what your intentions are the ones that are for single wheels only probably can't be used because of the offset of standard wheel. There is someone else on this forum that bought some adaptors. But he is mounting super singles instead of duals.
