Best Climbing Cams Guide

Engineering the Ultimate Trad Rack

Spring Loaded Camming Devices, or SLCDs, revolutionized the world of traditional climbing. Before their invention, climbers relied on passive protection like nuts and hexes, which required specific rock geometries to remain secure. The advent of the cam allowed for secure placements in parallel sided cracks, opening up vast vertical landscapes that were previously unprotectable. Selecting the best climbing cams is not merely a matter of preference; it is a technical decision based on mechanical engineering, material science, and the specific geology of your climbing area.

Mechanical Fundamentals of SLCDs

At its core, a climbing cam works by converting a downward pull into outward pressure against the rock walls. This is achieved through the logarithmic spiral shape of the cam lobes. This specific mathematical curve ensures that the angle at which the lobe contacts the rock remains constant, regardless of how retracted the cam is within its range. This constant camming angle is critical for predictable friction and holding power.

Single Axle vs Double Axle Design

One of the primary distinctions in cam design is the axle configuration. Single axle cams, pioneered by early designs, offer a lightweight profile and often a greater degree of flexibility in very small sizes. However, they typically have a narrower expansion range.

Double axle designs, most famously utilized in the Black Diamond Camalot series, allow the lobes to collapse further, providing a significantly wider expansion range for each unit. This means a climber can carry fewer cams to cover the same range of crack sizes. Furthermore, double axle cams often feature a higher passive strength rating because the lobes can act as a traditional nut if the cam is fully opened in a flared crack.

Expansion Range and Constant Camming Angles

The expansion range is the difference between the minimum and maximum width a cam can securely fit. While a wide range is desirable for versatility, it must not come at the cost of stability. Most modern cams use a camming angle between 13.5 and 14.5 degrees. A steeper angle provides more expansion but less outward force, while a shallower angle provides more holding power but less range.

Leading Brands in Modern Protection

The market for SLCDs is dominated by a few key manufacturers, each bringing unique engineering philosophies to the crag. Choosing between them often depends on the type of rock you climb and your personal preference for trigger feel and flexibility.

Black Diamond: The Industry Standard

Black Diamond has set the benchmark for decades with the Camalot C4. Their double axle design provides the widest range in the industry for standard sized cams. The C4 is known for its durability, smooth trigger action, and color coded slings that make identification easy during high stress moments on a lead. For those looking to shed weight, the Camalot Ultralight series utilizes a Dyneema core stem to reduce rack weight by up to 25 percent without sacrificing the trusted geometry.

DMM: Precision Welsh Engineering

DMM, based in North Wales, produces the Dragon and Dragonfly series. The Dragon cams are double axle units that feature extendable slings, which reduces the need for quickdraws and helps minimize rope drag and cam walking. DMM is renowned for its hot forging process, which allows for intricate lobe shapes that maximize grip and minimize weight. Their Dragonfly micro cams are specifically designed for the smallest cracks, offering impressive holding power in marginal placements.

Totem: The Revolution in Flared Cracks

Totem Cams have gained a cult following due to their unique internal loading system. Unlike traditional cams that load the stem, Totems can load individual lobes. This allows them to stay secure in shallow or flared cracks where standard cams might pull out. The flexibility of the Totem stem is unmatched, virtually eliminating cam walking. For technical granite or limestone climbing where placements are often irregular, Totems are frequently considered the best option.

Anatomy of a High Performance Cam

Beyond the axles and lobes, several other components dictate the performance of a cam. The stem design is critical for how the cam behaves once placed. Single cable stems are the most common, providing a balance of stiffness for easy placement and flexibility to prevent the rope from moving the cam.

Trigger wires and bars must be robust yet responsive. Frayed trigger wires are a common point of failure in older gear, so modern designs use protected or reinforced cables. The thumb loop or thumb press also dictates how easily a climber can manipulate the device while wearing gloves or dealing with pumped forearms.

Safety, Maintenance, and Longevity

Climbing gear is an investment in your life. Regular inspection of your cams is mandatory. Look for signs of "walking" where the cam has moved deep into a crack, potentially becoming stuck or reaching a wider section where it could fail. Clean your cams regularly with warm water and a mild detergent to remove salt, grit, and old lubricant. Apply a dry, wax based lubricant to the springs and axles to ensure the lobes move freely.

Retiring a cam is a difficult but necessary decision. If the lobes are significantly deformed, the cables are frayed, or the action is no longer smooth despite cleaning, it is time to replace the unit. Most manufacturers recommend a maximum lifespan of 10 years for the metal components and 3 to 5 years for the textile slings, even if they appear in good condition.

Final Thoughts on SLCD Selection

Building a rack is a gradual process. Most climbers start with a set of standard sized double axle cams and slowly supplement them with specialized micro cams or offset cams for specific types of rock. Whether you choose the versatility of Black Diamond, the precision of DMM, or the specialized grip of Totem, understanding the technical limitations and strengths of your gear is the first step toward becoming a competent and safe traditional climber.