As the sheave is situated within the drum of the drive alongside the permanent magnets it cannot be replaced. To prevent the need of this ever occurring, the sheave is made of stronger that normal steel (HB260-300) meaning that the sheave will last a lot longer. Also, the manufacturer has also increased the amount of grooves so that if this were ever to wear, the ropes could be moved into different grooves which consequently doubles the usable life of the drive.