Outer size 37.5″. Inner size 39.25″. Top connection thread 12mm (female). Bottom connection thread 12mm (female). Fits many Adventure, Tao-Tao, Italica, Roketa, Baja, GY6 QMI/QMJ 152/157, Qingqi, Roketa, SUNL, Tank,Kazuma, Carroll, Stream, Eagle, Redcat, Giovanni, Aimex, Jackel, Wildfire, Xtreme, Seaseng, Qlink, Yiben, Jonway, JMstar, Vento, TNG, Diamo, Verucci and many more chinesse scooters. Product Description Outer size 37.5″. Inner size 39.25″. Top connection thread 12mm (female). Bottom connection thread 12mm (female). Fits many Adventure, Tao-Tao, Italica, Roketa, Baja, GY6 QMI/QMJ 152/157, Qingqi, Roketa, SUNL, Tank,Kazuma, Carroll, Stream, Eagle, Redcat, Giovanni, Aimex, Jackel, Wildfire, Xtreme, Seaseng, Qlink, Yiben, Jonway, JMstar, Vento, TNG, Diamo, Verucci and many more chinesse scooters.