• Length: 729mm
• Top Width: 17.5mm
• Groove Angle: 30°

Gates Powerlink Standard CVT Drive belt （Long Case 50cc 4-stroke 139QMB）size：729-17.5-30. Commonly found on 50cc 4-stroke QMB139/GY6 engines.Fits Twist N' Go Venice 49cc, Twist N' Go LS 49cc and Twist N' Go Milano 50 (49cc) '04-'07. Premium quality Gates Powerlink 729 17.5 scooter CVT belt. Fits automatic CVT street scooters as well as many ATVs, dirt bikes, and go karts. Premium quality Gates Powerlink belts exceed the durability and longevity of OEM belts provided in Chinese made GY6 4-stroke engine gas scooters. Gates belts retain dependability throughout a wide range of speed and load variations and are specifically designed for use in continuously variable speed transmissions. 729 17.5 CVT belts are typically used on 50cc 4-stroke GY6 scooter engines. 729 (First number in the series) = The length of the belt in millimeters.17.5 (Second number in the series) = The width of the belt in millimeters.30 (Third number in the series) = The angle of the teeth on the belt. supported the Brands of BAOTIAN, BASHAN, BENZHOU, CFMOTOR, CHARMING, DAYANG, DINLI, FUXIN, GEELY, GILERA, HANGLONG, HAOJIN, HAOJUE, HISUN, HONGZHOU, HUATIAN, JIAJUE, JIANSHE, JINLUN, JMSTAR, JONWAY, KAITONG, KEEWAY, KINROAD, KYMCO, LIFAN, LINGBEN, LINGTIAN, LINHAI, LINTEX, LONCIN, LONGJIA, MAWI, MEIDUO, MOTORRO, PIAGGIO, QINGQI, RHON, RIEJU, SACHS, SHINERAY, SKYGO, SUKIDA, TAOTAO, VESPA, VONROAD, WANGYE, WONJAN, XINGYUE, XINLING, XINTIAN, YIBEN, YINGANG, ZHONGYU, ZNEN, ZONGSHEN, etc.