Why is it important to match rope size to the sheave?

• A. The rope will slip more
• B. The rope will last longer
• C. The rope will be easier to handle
• D. The WLL of the rope will be reduced

Answer: (D)

Matching rope size to the sheave is about how the rope is bent and supported as it moves over the pulley. If the rope diameter doesn’t fit the groove and radius, the rope ends up bending too sharply or not seating properly. That concentrates stress, accelerates wear, and can cause bending fatigue. Over time, this reduces the rope’s usable strength under load, so the working load limit is lowered.

Rope slipping or easier handling aren’t the core safety implications of a mismatch. Slipping might occur in some cases, and handling can be affected, but the most direct and important consequence for safety and performance is the reduced WLL due to improper bending and increased wear.