A pulverizing mill is provided with a spider frame which is mounted on the main pulverizing rollers. Flexibly secured to the spider frame are spacer means which are positioned between the rollers.
Reinforcement sections are provided at an outer surface and at an inner surface of a tire for a roll wheel assembly used in a pulverizer for crushing a material such as coal. These reinforcing sections cause the tire to be asymmetrical and are located on the tire only at areas where the wearing of the tire is highly predictable. The reinforcing sections provided on the inner surfaces of the tire are provided directly opposite of the reinforcing sections on the outer surface for preventing the localized thinning of the tire and extending the time interval between rotation and/or replacement of the tires.
