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Black Diamond C4 Ultralight Review

These are our favorite cams for all around use
Black Diamond C4 Ultralight
Editors' Choice Award
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Price:  $100 List | $88.45 at Amazon
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Pros:  Super light, durable, easy to place while free climbing, great range
Cons:  Expensive, need for potential early retirement
Manufacturer:   Black Diamond
By Matt Bento ⋅ Senior Review Editor  ⋅  Jan 30, 2018
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#1 of 9
  • Free Climbing - 20% 10
  • Weight - 15% 9
  • Range - 15% 9
  • Horizontal Cracks - 15% 6
  • Tight Placements - 15% 6
  • Durability - 10% 9
  • Walking - 5% 7
  • Aid Climbing - 5% 7

Our Verdict

Black Diamond Camalot Ultralights have everything our testers love about the Camalot C4s at 75% of the weight. Say what you will about the long-term durability of Dyneema, or how the price of a rack of Ultralights will shock load your wallet. When our lead tester went to grab a #2 and place it in a hand crack, for a second, he thought he'd accidentally grabbed a much smaller cam. This is an absolute game changer when it's time to travel far into the backcountry, or in if you're climbing in Indian Creek where it's not uncommon to climb with 5 or more #4s at once. Light is right, and we feel that all the tweaks and redesigns to make these cams lighter hasn't affected their durability all that much, and we'd recommend these featherweight cams for free climbing or big wall climbing just about anywhere.

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Our Analysis and Test Results

The Black Diamond Camalot Ultralight trims down the weight of the Camalot C4 in several obvious and a few not so obvious ways. The main way that they trim weight is by swapping out a metal cable in the stem for a dyneema sling (you heard that right), surrounded by a plastic sheath. Placement for placement, their more rigid than the most flexy stemmed small cams, which makes them easier to place on the go, but not as effective in flares, pin scars, and horizontal placements.

These cams have color-coded anodized aluminum lobes for easy size identification.
These cams have color-coded anodized aluminum lobes for easy size identification.

Performance Comparison

These cams were the lightest in our review.
These cams were the lightest in our review.

Free Climbing

We love free climbing with these cams, especially in Indian Creek, where continuously parallel splitter cracks require tons of cams that can start to feel incredibly heavy.

Because the stem is semi-rigid, they are very easy to place on the go when you're super pumped, the plastic thumb loop provides a nice spot to bite down if you have to hold the cam in your mouth, and the brightly colored anodized aluminum lobes make for fast and easy identification.


As suggested by their name, these cams are all about the weight game and are lighter overall than any of the other cams we have compared them to in to medium and large size ranges.

Their main contender for lightweight champion is the Best Buy Award winning Metolius Ultralight Mastercam. An equivalent size run of Mastercams weighs just 1.3oz more than the BD Ultralights and covers the same range with six cams that BD covers with 5. Each Black Diamond cam covers a wider range, thanks to the double axle design, but cam for cam, the Metolius cams are lighter. The merits of having more cams or fewer cams that cover a wider range of placements are dependent on what style of climbing you're doing. For easy alpine climbing where you'll be using less protection per pitch, we'd go with the Black Diamond Ultralights.

The double-axle design allows larger lobes to be retracted smaller  making for a bigger range.
The double-axle design allows larger lobes to be retracted smaller, making for a bigger range.


Currently, the Ultralights protect cracks from 15.5mm to 114.7mm. That's fingers to fists, but no blue tips size, and no large big purple or green cams for protecting offwidths.

We'd love to see Ultralight versions of the larger sized C4s, where the weight savings could really add up. As is, most other cams that protect the medium to large size range protect a wider range overall, but whatever you can't buy in Ultralights you can always pick up in C4s.

These cams flex in the direction of downward pull  making them effective in horizontal placements.
These cams flex in the direction of downward pull, making them effective in horizontal placements.

Horizontal Cracks

Camalot Ultralights perform just as well in horizontal placements as their heavier C4 brethren. The cable that comprises the thumb loop and stem on the C4s has been replaced by a lightweight Dyneema core, but we feel like both designs bend and flex with about the same resistance.

Their stem is flexible enough to bend in the direction of pull and hold a fall when placed in a horizontal, without breaking the stem, though the stem can become permanently kinked if the cam is in a shallow horizontal placement. For these kinds of placements, we recommend a more flexible stemmed cam for ideal performance.

Tight Placements

Black Diamond has reduced the weight of the Cam lobes on the Camalot Ultralights by reducing the amount of aluminum used on each lobe, but that doesn't make the head of these cams any narrower than the C4s.

That makes these cams too wide to fit in many pin scars found on Yosemite granite. Black Diamond X4s have a much narrower head and cover smaller cracks. While these cams are really light, they simply aren't made to sizes small enough to protect placements that we would call "tight," so look to supplement them with another style of finger and micro-sized cams.


If you don't want these cams to walk, extend them with an alpine draw. Because their stem isn't floppy like an "Alien" style cam, they're more likely to shift around if you're not climbing directly above them.

Cams that come with an extendable sling allow for easy extension without the use of an alpine draw, which not only lowers their likelihood of walking, but also saves some gear on the harness. These cams have an advantage over the Camalot Ultralights when it comes to walking. That being said, since these cams have broad heads and are relatively stable in a parallel placement.

To save weight  the Ultralight (pictured here on the right) trades the old cable stem for a lightweight Dyneema core.
To save weight, the Ultralight (pictured here on the right) trades the old cable stem for a lightweight Dyneema core.


Our testers were skeptical about the durability of these cams, especially in comparison to our trusty old C4s.

After months of hanging dogging, whipping, cam jugging, and weighting them in awkward positions, the Camalot Ultralights have shown surprising durability. The stem is made from Dyneema, protected by a tough plastic, and so far we have seen no limits to their durability.

Aid Climbing

When it comes to aid climbing, these cams perform just as well as the C4s, but with the advantage of being 25% lighter. The weight savings is considerable if you're carrying doubles, a rack of iron, a hammer, hooks, a portaledge, and a poop tube down the east ledges.

As far as pin scars, flares, and other weirdness encountered while aiding, we like to complement a rack of Ultralights with some finger size pieces that have a narrower head and a more flexible stem. And frankly, most of the placements you need to protect while aid climbing on all but the easiest of trade routes will be smaller than what an Ultralight is designed for.


The Ultralights are not cheap, and you'll be ravaging your wallet for a full set of seven. Despite the price, we encountered plenty of people in Indian Creek this fall who had chosen weight savings over dollars. The Dyneema stem seems to be holding up just fine on our Ultralights, but we feel that the steel cable in the original C4s would last longer, especially if the plastic gets worn through.


If you can pony up the extra dough for a rack of ultralights, do it! These Black Diamond C4 Ultralights are everything we love about the C4s, at 75% of the weight, bringing big smiles to our faces every time we rack the #4. The price may shy away some, but we have seen so many shiny racks of brand new Camalot Ultralights at Indian Creek, suggesting that the future is looking lighter.

Matt Bento