Profile: Grey Hub Trolley Wheel Co. manufactures quality crane wheels for the material handling industry. We specialize in custom wheel applications and produce a line of standard size trolley wheels, machined from gray iron castings, for use on standard equipment throughout the industry such as I-beam and patented track. We machine custom wheels with a large variety of tread styles, widths and sizes from 1-7/8" up to 14" diameter. Custom styles and sizes are machined to the required specifications. Crown and flat tread, V-groove, single and double flanged, geared and idler wheels are offered.