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Gear Review - Metolius Offset TCUs

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By John McNamee
Administrator
From Littleton, CO
Nov 5, 2007
Pitch 7

Metolius Offset TCUs



offsets

Can you spot the Offset Cams?

On a recent Supertopo.com forum thread a person asked for advice on alternatives to Alien hybrids. Generally the majority of the people posting stated that there were no alternatives and just suck it up and order Aliens.... After my recent experience with Metolius Offset TCU's, I'm not so sure that I fully agree...

From the Metolius web site:
Metolius Offset TCUs are designed specifically for hard to protect flared micro-fissures & pin scars. They use two smaller cam lobes and one larger lobe to accomplish this.

Offset Cams are specialized pieces designed to fit in flaring pin scars, primarily for aid climbing. Cams placed in flaring cracks are far more susceptible to pulling out than placements in parallel-sided cracks. Climbers using Offset Cams should be very experienced in the art of cam placement and thoroughly understand the limitations of cams placed in flaring cracks ...


offsets

Full set of Offsets

TCU comparison 2

Standard TCU compared to Offset.

Offset Aliens

Alien Hybrids (Photo: Chris Miller)
Notice the difference in color coding.

Offset Aliens detail

Alien Hybrids (Photo: Chris Miller)

Aliens have a well deserved reputation as the most flexible small camming units on the market, and in particular they have always had a strong niche following with aid climbers and thin crack aficionados. The recent concerns about quality control may have had an impact with free climbers, but for body weight aid placements they still are very popular. Last year I tried to buy some hybrid aliens but they were as scares as hen's teeth, so I ended up purchasing a set of offset tcu's instead.

Specifications
The Offsets are designed on the successful ultralight pattern, which are the lightest camming units on the market. The main features include:

  • Direct Axle Technology (DAT) makes Metolius cams the lightest in the world; opens more placement options in bottoming cracks and shallow pin-scars while providing the best visibility of cam lobes in tricky placements.

  • Opposing tube and Dyneema sling colors enable easy identification as an Offset TCU. The color of the sewn sling denotes the size of the two smaller cam lobes; the tubing color represents the large cam lobe size.

  • CNC machined cam lobes from 7075 T-6 aluminum, for the tightest tolerances and greatest strength to weight ratio.

  • 13.25 degree cam angle for more outward force means Greater Holding Power!

  • U-shaped body for greater durability & unparalleled control during placement and retraction

  • Range finder system makes them easier and safer to place. Does anyone actually use this placement aid?

markings

Offset Range FInder System

So how do they compare with aliens. The chart below does a comparison between TCU Offsets and Alien Hybrids. There are 5 TCU's compared to 7 Aliens, with the Aliens covering a wider range.

spreadsheet


First Impressions
As you would expect from Metolius, the engineering and manufacturing look very professional and of excellent quality. Take one look at these cams and you know they are not going to fail under their stated strengths. The color coding is easy to figure out and at a glance, you can tell whether it is a offset or a standard cam. The color of the sling denotes the size of the smaller cam lobes, whereas, the tubing color represents the size of the larger cam lobe.

offset comparison

Standard compared to Offsets. Can you spot the Offsets?

The head width between the aliens and TCU's is practically identical so I haven't included those settings in the above chart. Using a ruler I can't tell the difference but if you used a micrometer you might see differences in the .000 range. Maybe I need to buy one...

Perhaps the two biggest differences between alien and TCU Offsets are the number of cam lobes and the stem design. You can debate the stem design till the cows come home and I'll leave it up the everyone to argue the pros and cons. In my own findings, bearing in mind that I haven't climbed anything harder than C3 is that the stem hasn't been an issue. I was skeptical at first, but the more I've used them, the more I've come to like the design and understand how it works. I've also started to wonder whether some of my previous understandings about the stem design, where based on fact or fiction.

Some reviewers have stated that U steams when used in placements where the axle of the cam is not horizontal to the ground, can cause the force to be transferred to the head of the cam. I haven't found this to be a problem. The cam has held fine in my placements. By the way the U stem design also allows you to clip the aiders into the stem rather than the sling, gaining a few precious inches.

Another concern expressed to me was that in thin placements, the stem on the outside of the head could infringe on the placement. I haven't run into this problem either. Hopefully, people with more aid climbing experience can add their two cents worth... Like I said above I don't do hard aid.

You would think that three lobes would be narrower than a four lobe cam unit. This is true in the case of Black Diamond C3's, but comparing Alien hybrids and Offset TCU's the widths are pretty much the same. There may be only three cams but the lobes are relatively wide.

You would think that three lobes would be narrower than a four lobe cam unit. This is true in the case of Black Diamond C3's, but comparing Alien hybrids and Offset TCU's the widths are pretty much the same. There may be only three cams but the lobes are relatively wide.

The amount of force that a cam pushes against the sides of the crack is determined by the cams angle, not the width of the cams. Metolius has some of the lowest cam angles in the business and the angle on these TCU's is 13.25 degrees. This angle determines how much outward force is generated (against the rock walls) in a loading event. A smaller cam angle generates more outward pressure, but gives the cam itself less range. A bigger cam angle develops less outward pressure, but actually gives the cams more range. So, it's a compromise between cam range and holding power.

However, the width of the cam face is also important, as it determines how much load is spread out over a given area, thereby reducing the pressure exerted on the rock. For example, take a look at Metolius Fat Cams which are made specificially for softer rock and have wider cams faces. In very soft rock it is possible for very narrow cams to actually trench into the rock and "umbrella the cam open" or pull-out. Something you really don't want to worry about when sketched out above pro!

If you find my explanation confusing check out the following link I found on the Metolius website that does a much better job at explaining this. Cams and holding power

Another nice feature are the cam stops. This prevent creating an inverted umbrella of the cam. Aliens don't have cam stops.

The cams also have the familiar Range Finder system that is featured throughout the TCU design. I'm not sure if anyone actually uses this placement advisory tool, but it's a novel feature to say the least and to new leaders it could be a selling point for new leaders

orange TCU


Yellow/Blue Offset compared with Yellow TCU

Conclusions
Offset TCU's really shine in the finger size pocket and pins scars we see on old aid routes that are now being climbed free or with clean aid. I used the orange yellow unit many times on a recent trip to Zion. It was my go to piece whenever I was looking at a pocket or pin scar that was very flared. Places where in the past I might of fiddled in a two cam unit or a tricam, the offset would slot right in and have good lobe contact. I was so impressed with them that I would start talking to myself about them as I bounce tested them enthusiastically.

At 49.50 each, they represent great value and I have no hesitation of recommending them. If you want to just pick up a couple, go for the Yellow/Orange and the Orange/Red units, as these are the ones that you will be reaching for with pin scars.

I have seen sets online for as low as $185.00. That's about 37 a cam.

Aid Climbing is all about having placement options, and I think the Metolius Offset TCU's do just that in adding another arrow to your quiver. For free climbing areas like Lumpy ridge in Colorado, place a few offsets on a biner and you won't even notice the added weight... The next time to go climb George's Tree, they're come in real handy!

Disclosure:
I paid full price for this set of Metolius Cams.

I hope you're enjoyed reading this review and I look forward to your comments.

By Ryan Forbus
From Marietta,Ga/Auburn,Al
Nov 5, 2007

Great write up. I've been wondering about these for a while. You answered most of my questions.

By Jordan Ramey
From South Pasadena, CA
Nov 5, 2007
What was left of the rack when I topped out on the last pitch of Snake Dike on Half Dome.

Now that's the kind of review I like to see. Thanks.

By Paul Hunnicutt
From Boulder, CO
Nov 5, 2007
Half Dome

My partner and I recently used these for 2 weeks in Yosemite and they were the best pieces on our rack. Every time we placed one we felt utterly confident in the piece. I like them better than my Alien offsets, which for some reason just don't seem to sit as well in the cracks as the TCU offsets (though I still love my old Aliens). They worked great for aiding on El Cap as well as free climbing routes like the Rostrum and Serenity Crack. I can only imagine they would be incredible at Lumpy Ridge, the Needles, or just about any other crack area. Anywhere the cracks vary in size, are pin scarred, or flaring these will place well (so pretty much anywhere except splitter desert cracks). I actually like the less flexible stem as it makes them really easy to place then the Aliens. Especially when you are high-stepping or gripped free climbing in a difficult position. I don't know who would ever use the range finder except while playing around with them at REI...but I guess that is a plus.

As much as I love BD, these seem to place better and I had more confidence in them than the C3's (which aren't offsets, but just another comparison). My only complaint is that sometimes I find it more difficult to get my fingers properly placed on the TCU trigger than Aliens and C3's. Overall, I would highly recommend them.

By John McNamee
Administrator
From Littleton, CO
Nov 9, 2007
Pitch 7

I had a couple of errors about the width of the cam and holding power that I've now fixed. I also added a link to the Metolius web site that explains in greater detail about cam angles, holding power, etc.

By Brian in SLC
From Salt Lake City, UT
Nov 9, 2007
Climbing in Smuggler's Notch

Great review, John.

"I was so impressed with them that I would start talking to myself about them as I bounce tested them enthusiastically."

Methinks you solo aid climb too much... Ha ha.

Been thinkin' I need to pick up a set of these. Big fan of the Metolius cams, especially in Zion sandstone (where they've held a fall a time or two for me, when I thought I was going for the big ride). And, they are light.

Need to put them on my x-mas list.

Thanks!

By Killis Howard
Nov 13, 2007

Thanks for the great review. Helpful, good stuff.

By John McNamee
Administrator
From Littleton, CO
Nov 13, 2007
Pitch 7

Thanks for the feedback.

Brian,

Yes you're probably right. I've been doing a fair bit lately but climbing will soon come to grinding halt once the snow starts to fly!

Berthoud Pass<br />


Cheers

John

By leo
From Peoria, AZ
Jul 12, 2008

Hello .

Thanks for a great review. I own two sets of offset tcu's, and enjoy placing them as they take the bite off of many flared placements.
however, I must disagree with the comment regarding the head width. I've been climbing with both aliens hybrids and offset tcu's, and found that the u - stem design prevent some odd flared placement where the pin scar is too shallow to accept the metolius offset but will accept ( marginally ) an alien hybrid of similar size.
also, in those awkward placements, the flexibility of the tcu's seems to somewhat compromise the integrity of the placement, vs. an acceptable ( for body weight ) placement by the aliens.
on the other hand, aliens are hard to get, and their quality control falls short in comparison to metolius's standards.
to conclude, on those skechy aid pitches I tend to Carry both offsets tcu's and alien hybrids, and feel much more relaxed with a well placed metolius, but still plug a hybrid when all else fail.


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