Climbing Anchors - The ideal sport route lower-off?

Looking for the ideal sport route lower-off configuration is like a quest for the holy grail. There are so many different setups and configurations, and generally, they all generally have some advantages and disadvantages.

Let's look at a few different configurations for pro's and con's.

A custom chain setup.
Visual impact: Bad. This is a pretty visually obtrusive anchor.
Expense: Bad. High cost due to number of components.  
Rope-twist factor: Good. Low.  
Lifespan: Good. Where the rope touches are rings which spin, spreading the wear.  
Replace-ability: Good. Mallions attach the chains.  
Convenience: Bad (no clip and lower).  
Single clip safety: Bad. Ideally you want to clip to the anchor and be immediately attached to two bolts.

Horizontal Fixe rings - quite common setup.
Visual impact: Good. No chain involved, so pretty low impact.  
Expense: Not bad.  
Rope-twist factor: Not great. Even if this was threaded correctly (not like the photo) this configuration does twist the rope.  
Lifespan: Good. Where the rope touches are rings which spin, spreading the wear.  
Replace-ability: Good. Tru-bolts have been used (the only time I recommend their use!) to enable the anchors to be removed and replaced.  
Convenience: Bad (no clip and lower).  
Single clip safety: Bad. Ideally you want to clip to the anchor and be immediately attached to two bolts.

Commercial Fixe anchor set. Very common.

Visual impact: Moderate.
Expense: Moderately expensive.
Rope-twist factor: Good. Single ring sits perpendicular to the wall. No rope twist.

Lifespan: Good. The rope wears the ring, which can spin and spread the wear.  
Replace-ability: Not great, as you have to replace the entire anchor, or chop the ring and install an alternative.
Convenience: Bad (no clip and lower).  
Single clip safety: Good - you're always on two bolts. This makes for a good multipitch anchor, and quite a good sport route lower-off, if somewhat inconvenient.

Commercial unit from 'Raumer'
Visual impact: Not great. It's a pretty big beast. The double-chain version of this is even more obtrusive.  
Expense: Reasonably expensive as this is a commercial product.  
Rope-twist factor: Good. Lowering off a single point minimises rope twist.
Wear!
Lifespan: Bad. In high-traffic areas, this thick stainless carabiner will be worn through in a year or two (see right).  
Replace-ability: Bad. When the carabiner is worn out, it's quite a job to chop it off with a grinder. This leaves a spinning ring which you can lower off, or put another captive steel carabiner with a mallion. The other option is to replace the entire unit with an identical unit.
Convenience: Good. Clip and lower, baby!
Single clip safety: Good. You can clip anything and you're attached to two bolts.

Two naked glue-in rings.
Wear on ugly U-bolt. Bad!
Visual impact: Good. About as low-impact as you can get.
Expense: Good. Pretty cheap.
Rope-twist factor: Not great. This configuration does twist the rope.
Lifespan: Bad. Rope-wear will wear these bolts out (see right). This anchor can be good for very low traffic routes, but as soon as wear is noticed, install some mallions and chain.
Replace-ability: Bad. Once these wear out you have to heat them with a blowtorch to melt the glue and then extract. It's pretty full-on! Lazy people would chop them but this is messy at best.
Convenience: Bad (no clip and lower).
Single clip safety: Bad. Ideally you want to clip to the anchor and be immediately attached to two bolts.

Fixe ring and chain combo.
Visual impact: Moderate. Chain always stands out, but at least this is only one length.  
Expense: Moderate. There are a few components here. Cheaper than most commercial setups though.
Rope-twist factor: Good. Placed in this configuration, the thread point acts as one. Minimal twist.
Lifespan: Good. The ring will spin. The chain is easily replaced.
Replace-ability: Good. All wearable components are easily replaced.  
Convenience: Not great (no clip and lower) but at least you have plenty of clip points.
Single clip safety: Bad. Ideally you want to clip to the anchor and be immediately attached to two bolts.

Glue-in rings with twist-shackles for "replace-ability"
For a while, climbers started to use twist shackles because they would not twist the rope and you could replace the components that wear. Seems like an ideal solution, right?  
Why this is not good: The shackles can flip around so the rope is running over the pin of the shackle. This can undo the shackle (!!). People have tried to overcome this by "mousing" the shackles in position using wire or cable ties, but ultimately, this turns into a mess. Avoid twist shackles.

"Mussy hook" lower-off. Gaining popularity in America.
This setup ticks a lot of boxes but has some drawbacks.
Visual impact: Moderate. They're very beefy, no doubt.
Expense: Good. These mussy hooks are supposed to be quite inexpensive (available in large hardware stores like Home Depot). Beware however cast versions of these - probably from China, and strength unknown.
Rope-twist factor: Could be a big problem unless they can sit off the rock. Mike Law says "I lowered off a lot of Muzzy hooks in Owens River Gorge and they destroyed ropes by twisting, I think the fat ones have a thick spine and sit so far off the wall that rope tension pulls them over at about 45 degrees, towards each other."
Lifespan: Good. The mussy hooks have a huge rope-bearing surface and are very thick so they'll take a long time to wear to about halfway where they can be replaced.
Replace-ability: Good. The hooks are easily replaceable via the mallions.
Convenience:
Great! Clip and lower!
Single clip safety: Bad. Ideally you want to clip to the anchor and be immediately attached to two bolts. 

Rotating rings, replaceable!

Visual impact: Moderate. They're very beefy, no doubt.
Expense: Moderately expensive. But everything here will last for a very long time, and will be easy to replace.
Rope-twist factor: Not as good as a single point, but not bad.
Lifespan: Superb. For starters, everything is 316 stainless, and the glue is Hilti RE-500, the best there is. The rings freely rotate, and when and if they need replacing, this is easily achieved via the mallions.
Replace-ability: Super.
Convenience:
Average.
Single clip safety: Ordinarily I would rate this "bad" but in this case, I give it a "good" based on the fact it's a stainless glue-in with the world's best glue, in granite. You're good. 

CONCLUSION
As you can see there is no "right answer" when it comes to sport-route anchors, but there are materials and techniques that are nearly always more appropriate than others. Route developers should always be thinking "When this anchor is worn, how easy is it to replace?"

Further reading:
To learn even more about bolting, read my 2013 updated article "How to bolt rock climbs, and how not to"

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