http://pastport.jp/user/Heiyi-belt/timeline/cogged%20v-belt%20vs%20v-belt The performance of cogged V-belt is better than that of ordinary V-belt. The teeth can dissipate heat and reduce noise, increase the number of belt bends, and ensure that the belt will last longer. The service life of cogged V-belt is 30% - 50% longer tha ja-JP