Which type of control cable must be used when pulleys change the direction of cable travel?

• A. Extra-flexible cable (7x19).
• B. 7x7 cable.
• C. Rigid steel cable.
• D. Coaxial control cable.

Answer: (A)

When a cable has to change direction around pulleys, it must bend easily without kinking or wearing out quickly. The extra-flexible control cable, built with a 7x19 strand construction, has many small wires that allow it to flex smoothly and endure repeated bending. This makes it well suited for routing around pulleys where the cable direction changes.

Rigid steel cables would resist bending and could bind or fail under cycling. Coaxial control cables are intended for signaling rather than pulling loads and aren’t designed for mechanical control around pulleys. A 7x7 cable is flexible but not as capable as 7x19 in handling multiple tight bends, so it’s not the best fit for changing cable direction around pulleys.

So, the extra-flexible 7x19 construction is the proper choice for pulleys changing the direction of cable travel.