Ground Support Products' running gear: '#8729; Fits most manufacturers specs. '#8729; GSP's hub fits the pilot of its wheel within .05 inches, which ensures the weight of the load is carried on the barrel of the hub and not on the lugs '#8729; GSP's welded adapting plate on the hub and axle assembly provides a more secure and reliable attachment to the rear post or verticle spindle mount '#8729; GSP's 3-stage 'soft ride' 100 percent natural rubber solid tires are mounted on a 7 gauge rim