Sheave size and wire rope strength

Bending wire rope reduces its strength. To account for theeffect of bend radius on wire rope strength when selecting asheave, use the table below.

Ratio A=  Sheave Diameter

                Rope Diameter

So, the greater the proportion, the longer the life of the sheave, but the greater the proportion, the greater the weight and achievements of the sheave. Therefore, the general recommended ratio of 20.