I bought one of these today http://www.ebay.com/itm/10-Fixed-Cas...71161256414%26 at Harbor Freight to make my bike trailer. I looked at a used 20" bmx bike to use the wheel and front forks to make it but I chose this instead. I don't know if it will have more cushion than the bmx tire or not but it's smaller round so I am thinking it will help keep the size of the trailer smaller. I will to build it with enough ground clearance. I would have bought just the tire and that kind of hub and made my own axle but they don't sell them that way. It weighs five pounds, don't know it that would have been more, less or the same as the 20" bike tire and forks.