A disassortative hub avoids connecting to other hubs. Wuhan Railway Hub is considered one of the four key railway hubs of China. There are regional airports in other cities that connect to these three hubs. It also had Nisi rims, Campagnolo hubs and Pirelli tyres. It has 25 connections to major airline hubs and leisure destinations. Many companies sell bicycle frames designed specifically for use with fixed-gear hubs. These are usually used for long-haul flights between airline hubs and major cities. They rode large unicycles equipped with two-speed Schlumpf geared hubs. Warehouses were built close to the major stations in railway hubs. Chicago is one of the largest hubs of passenger rail service in the nation. Bangkok is one of Asia's busiest air transport hubs. Asahikawa is one of the major rail hubs of Hokkaido. There were two ways to use these conduits outside these hubs. The area developed into one of the city's major business and industrial hubs. Shanghai is one of the largest air transportation hubs in Asia.