Fourth Ring series cable device called GP4 our professional series cable device, because its interior has four bearings, so we called the Fourth Ring bearing cable device GP4 series cable rod Pitch Type Size Max thrust: N Weight: KG GP4-15 11 220 1.5 GP4-20 16 320 2 GP4-22 16 320 2 GP4-30 25 520 3.7 GP4-40 32 840 13 GP4-50 40 1400 38 GP4-60 48 2000 45 Fourth Ring Road and Third Ring difference: cable device other than the kringle structure of the device as well as the City of Victoria, dimensions and tricyclic basically the same. But its maximum axial thrust than tricyclic doubled for thrust occasions. Advantages: 1. Dimensions tricyclic consistent 2. Maximum axial thrust than tricyclic doubled for thrust occasion