NNX-D34 18X8.5 ET 45 P.C.D 5X112 center hole 57.1 1piece forged wheel (custom 16-24inch any date)   Two-piece forging   Single forging structures are relatively simple, but the strongest reliability. In high-intensity durability tests and fatigue tests, single forgedness_time attenuation rate is the lowest, and single forging is also the most structured and best-performing wheels. So almost all international and domestic car competitions choose single forging CSB forging_S series, M series, SR series are single forging, of which the super racing series is the highest level.   Two types of forging use two types of structures, namely the structure of the flag and wheels. The CSB forging two-piece forging uses the same barrel structure as the United States. The United States is the birthplace of multi-piece forging. During the decades of development of the wheels, the two types of two-piece structure have the highest stability and reliability. The benefits of forging two-piece wheels are that each piece of wheels and flags can be treated with different surface treatment methods. Those who have conditions can also purchase multiple sets of flag modeling to replace them separately.