On an 11 mm rope, which Prusik size is recommended?

On an 11 mm rope, which Prusik size is recommended?

• A. 6mm
• B. 7mm
• C. 9mm
• D. 8mm

Answer: (D)

Prusik sizing is about how big the friction cord is relative to the rope. The hitch bites by squeezing the rope, so you want a cord that’s smaller than the rope but not so small it won’t grip when loaded. For an 11 mm rope, a Prusik cord around 8 mm in diameter sits in a sweet spot—roughly 0.7 of the rope’s size—giving enough bite to hold when loaded and still release smoothly when you need to move. A 9 mm Prusik would grab too hard and be harder to release, while 6–7 mm would be too small to bite securely on an 11 mm rope. So 8 mm is the best choice.

Prusik sizing is about how big the friction cord is relative to the rope. The hitch bites by squeezing the rope, so you want a cord that’s smaller than the rope but not so small it won’t grip when loaded. For an 11 mm rope, a Prusik cord around 8 mm in diameter sits in a sweet spot—roughly 0.7 of the rope’s size—giving enough bite to hold when loaded and still release smoothly when you need to move. A 9 mm Prusik would grab too hard and be harder to release, while 6–7 mm would be too small to bite securely on an 11 mm rope. So 8 mm is the best choice.