#7 on this list
Step Up LT
Black Diamond
The Black Diamond Step Up LT is an ultralight pocket aider engineered specifically for alpine climbers, free climbers tackling routes with brief aid cruxes, and emergency escape scenarios. Built with narrow, high-strength webbing, it sheds nearly all the bulk and weight associated with traditional big wall ladders, rolling down small enough to disappear into a pocket or clip onto the back of a harness without tangling with protective hardware. On the wall, the Step Up LT delivers when you encounter a blank section of rock, a blown pendulum, or a wet seam that prevents free climbing. It provides multiple steps for gaining height, letting climbers pull past difficult moves or tension-traverse with functional foot support. For fast-and-light pushes where carrying a full set of bulky aiders would hinder movement, its packability is unmatched. The clear limitation is a total lack of structural rigidity. The steps do not have stiffening stays, meaning the webbing collapses flat against the rock under tension. Getting a boot into the lower loops requires patience and often assistance from your other foot or hand, which can be exhausting on sustained aid pitches. It is an emergency and intermittent-use tool, not a daily driver for multi-pitch wall climbing. **Highlights** - Packs down into an extremely small footprint for pocket or harness storage - Ultralight design adds negligible weight to an alpine rack - Provides full multi-step elevation for passing difficult free cruxes - Durable narrow webbing construction maintains high tensile strength - Ideal backup tool for unexpected aid sections on long routes **Watch-outs** - Unreinforced steps collapse flat, making boot entry difficult - Uncomfortable for sustained, multi-pitch aid leads or hanging belays
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#8 on this list
Micro Traxion
Petzl
The Petzl Micro Traxion is an ultra-compact, high-efficiency progress-capture pulley that bridges the gap between hauling hardware and mechanical ascenders. Built around a sealed ball bearing pulley and an aggressive, spring-loaded toothed cam, it boasts approximately 91 percent mechanical efficiency. It is a staple tool for big wall hauling, crevasse rescue systems, and alpine ascending kits worldwide. When pressed into service as an ascender, the Micro Traxion can be clipped to a harness or foot sling to act as an exceptionally smooth progress capture unit. Unlike traditional toothed clamps that introduce drag, the pulley wheel allows the rope to feed effortlessly upward during each stroke. In self-rescue and 3:1 hauling systems, its smooth operation substantially reduces the physical effort required to move heavy loads or haul injured partners out of slots. Despite its immense utility, the Micro Traxion has dedicated boundaries. It is not an ergonomic replacement for a handled ascender; it lacks a grip and is cumbersome to disengage from a rope while under partial load. It is also an expensive piece of hardware. However, for climbers wanting a single, ultra-reliable tool that handles hauling, rescue, and emergency rope climbing with maximum mechanical efficiency, it remains virtually unmatched. **Highlights** - High-efficiency sealed ball bearing pulley minimizes friction - Spring-loaded toothed cam provides reliable progress capture - Cam can be locked open to function as a simple, free-spinning pulley - Works effectively on muddy, icy, and wet ropes - Invaluable multi-use tool for hauling, rescue, and ascending **Watch-outs** - High price point compared to basic mechanical ascenders - Not designed for comfortable, full-time rope jugging
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Specs side by side
| Spec | Step Up LT | Micro Traxion |
|---|---|---|
| Gear Category | Ultralight pocket aider | — |
| Primary Material | High-strength narrow synthetic webbing | — |
| Step Reinforcement | Unstiffened, collapsing design | — |
| Packability | Folds into a palm-sized bundle | — |
| MSRP | Around $70 | — |
| Primary Use Case | Occasional aid cruxes and emergency bailouts | — |
| Device Type | — | Progress-capture pulley / ascender |
| Weight | — | 85 g (3.0 oz) |
| Rope Compatibility | — | 8 mm to 11 mm |
| Sheave Efficiency | — | 91 percent |
| Working Load | — | 2.5 kN (cam mode) |
| Certifications | — | CE EN 567, UIAA |
What our reviewers liked and didn't
Step Up LT
- Compresses down small enough to ride in an alpine jacket pocket
- Negligible weight makes it easy to justify on fast-and-light pushes
- High-tensile webbing provides dependable support through blank cruxes
- Integrates cleanly into emergency self-rescue and ascending kits
- Unstiffened steps collapse flat against rock, slowing boot entry
- Narrow webbing becomes uncomfortable during extended standing sessions
- Unsuitable for sustained, multi-pitch big wall aid climbing
Micro Traxion
- High 91 percent sheave efficiency dramatically reduces friction
- Toothed cam grips reliably on iced, muddy, and wet ropes
- Lock-back button quickly converts the unit into a free pulley
- Compact and lightweight build weighs only 85 grams
- High price compared to standard handled ascenders
- Lacks an ergonomic grip for full-time rope jugging
- Cannot be disengaged easily while holding partial load
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