Very important. With rev rate, it determines what is more important to the bowler; Radius of Gyration (RG) or Differential. More revs, less differential. Less revs, low RG, more differential.

• 非常关键！转速决定了球的RG或RG差何者对球员较为重要。转速快，RG差要小、转速慢则较适合低RG，高RG差的球。