Ascender Safety 101

       Ascending Rappel Ropes 101

       Autoblock Misuse (ATC-Guide)

       Avalanche Safety

       Belay School - Why Dynamic Matters

       Can A Hot Belay Device Melt My Slings?

       Carabiner Off-Axis and Tri/Quad-Axial Loading

       Choosing the Right Carabiner

       Common Belay Screw-ups

       Connecting Two Slings Together

       Daisy Chain Dangers

       Dangers of Rope Worn Carabiners

       Dangers of Worn Lowering Anchors

       Do Ropes Need to Rest Between Falls

       Draws in a Gym

       Extending a Cam Sling

       Fall Factors Explained

       Full Strength Haul Loops

       Gear Doesn't Last Forever—Crampons

       Gear Doesn't Last Forever—Ice Tool Picks

       Gear Doesn't Last Forever—Slings & Draws

       Girth Hitching a Stopper

       How Sketchy Is a Sharp-Edged Carabiner?

       How Strong are Himalayan Fixed Lines?

       How Strong is the Spinner Leash?

       How To Belay, Part 1

       How To Extend a Rappel Device

       Knot Passing 101

       Rappelling - Climbing's Diciest Business

       Re-Slinging Cams

       Rethinking the Double-Loop Bowline

       Retiring Old Ropes

       Sharpie for Marking the Middle of a Rope?

       Sling Strength In Three Anchor Configurations

       Spectra versus Nylon

       Spotting for Bouldering

       Surviving Bad Weather on El Cap

       The Dangers of Modifying Your Gear

       The Dangers of Short Static Falls

       The Electric Harness Acid Test

       The Skinny on Super Light Ropes

       Top Roping is Not So Safe

       To Screamer Or Not To Screamer

       Via Ferrata

       Weakness of Nose-hooked Carabiners

       What is the Safest Rappel Knot?

       Worn Belay Loops and Retiring a Harness

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Climb Safe: Dangers of Rope Worn Carabiners

By Kolin Powick

The following article is courtesy of Black Diamond Equipment.

There was an accident at the Red River Gorge where a climber fell going to the second bolt and the rope was cut completely through by the fixed draw's sharp-edged, rope-end biner at the first bolt.

If you recall the previous testing and commentary on this subject, I had stated that I'd only seen ropes getting "sheathed" by sharp-edged biners—usually mid-route—and subsequently learned of an accident in the Czech Republic (in a climbing gym) where the rope-grooved sharp biner (also at the first bolt) severed the rope completely, resulting in the climber hitting the ground. Luckily in both cases, the climbers were not badly injured.


Which biners get badly grooved and why?

From my experience falling all over routes, all over the county, I've noticed three primary locations where fixed biners become badly grooved:

1) First Bolt
Belayers typically stand too far away from the wall. This results in a sharp angle in the rope from the belayer to the first biner and then up the route. When lowering a climber, the rope, often dirty and gritty, slowly wears a groove in the biner. Both incidents I've heard of where the rope was cut completely, it was the first bolt that was the culprit.

2) Crux Bolt
Many climbers being lowered off the same biner (falling at the crux onto the same bolt). This has the same effect as above. The sharp angle of the rope wrapping around the biner and the weight of the climber being lowered is what is allowing the rope to slowly cut through the biner.

3) Out of line bolts
Often if the bolt line isn't straight, an out-of-line biner can end up being grooved. Once again, this is caused by the rope and its angle running over the biner surface.



We have done some testing before, but decided to do one more super quick test in our drop tower just to see what it would take to cut a rope on a sharp-edged biner in a harsh, but realistic, loading scenario.


  • Sharp-edged biner (actual biner used in test shown directly above)
  • 80 kg mass
  • brand new 10.2 mm rope
  • One harsh, but realistic, drop
  • Static belay



  • Rope cut on the FIRST drop (see image below)
  • Max load reached - ~7 kN



Once again, what does this mean? What does 7 kN actually mean at the piece of protection? What does it mean to you, the gear and the rope?

Well, 7 kN falls can and do happen in the field. These can occur:

  • usually when there is not much rope out (i.e., early on in the climb). With not enough rope out, there is little rope to help absorb the energy of the fall.
  • and with a close-to-static belay (i.e., belayer hauls in rope and even leans back, trying to keep the climber from hitting the deck.). Loads are decreased with a dynamic belay, but increase with a static belay.

The climber usually "feels" these sorts of falls. Your kidneys take a beating, your hips are sore, and your feet may even hurt from slamming into the wall. I've seen many a climber take a harsh fall low on the route—it's usually followed by a deep grunt and "lower me".

The reality is these sorts of harsh falls low on a route with a sharp biner in play and the rope running over its sharp edge at angle (belayer standing away from the wall) can, and obviously have, resulted in damaging and even cutting the rope.



Now I don't want to get into some ethical debate on whether routes should be left with fixed draws or not. The bottom line is you can do a few things to reduce the impact on fixed gear:

  • stand close to the wall when belaying, especially when lowering
  • use your own first draw on the first bolt of fixed routes
  • use long slings to help reduce rope drag
  • use steel biners on "high traffic" fixed draws

And of course, it's in everyone's best interest to replace worn and tattered fixed gear.

Be careful out there


Kolin Powick (KP) is a mechanical engineer hailing from Calgary, Canada. He has over 20 years of experience in the engineering field and served as Black Diamond’s Director of Quality for over 11 years. He is currently their Climbing Category Director. If you have a technical question for KP, please email him at and he will TRY to respond.

To help make more climbers safer climbers, Rock and Ice has teamed up with Black Diamond Equipment to present the information here.

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