In the mid-night of September 5^th, 2010, the largest domestic jumbo radial tire was built in Triangle Group’s second production base, symbolizing a new record of domestic jumbo radial OTR. Executives, engineers, operators and reporters from large medium agencies witnessed this event. The tire size is 40.00R57 with weight of 3.5 ton and outer diameter of 3.6 meters, mainly used for large haulage truck. It is important production materials in the field of mines, energy and engineering and has relied on import for a long time. Triangle Group developed domestic first jumbo radial OTR production line and finished all the works from original design, equipment manufacture, products research to engineering construction, and started production in less than two years.