1. (1) e.g., Iwashimizu S., Fluctuation of Sprocket Wheel Teeth Load in Chain Transmission, Bulletin of Laboratory in Ritsumeikan University, 61; 2002; 167 (written in Japanese).
2. (2) Homepage of Tsubakimoto Chain Co., (accessed on July 21, 2009)http://www.tsubakimoto.jp/press/press050303.html (written in Japanese).
3. (3) Nakagome M., Story of Chain, Japanese Standards Association, 1997; 101 (written in Japanese).
4. (4) e.g., Okamoto J., Nakayama K. and Satoh M., Approach to Tribology, Saiwai Shobo Publishing Co., 1990; 110 (written in Japanese).
5. (5) Standard of Japan Chain Association, Chains for Motor Bike, 1; 1981 (written in Japanese).