Plum S 170 review

The Plum S 170 is an ultralight, minimalist tech touring binding built for ski mountaineers who value low weight, simplicity, and reliability. At just 170 g per binding, with fixed RV 8 (lateral and vertical) and CNC‑machined 7075 aluminum, it delivers direct downhill feel and fast transitions—provided you’re okay without brakes and without adjustable release.

Who is it for?

Fast-and-light tourers, skimo/steep skiers, and expedition users counting every gram.
Skis up to about 100 mm underfoot, light to midweight touring and steep objectives.
Not ideal if you want brakes, wide skis, or fully adjustable DIN/RV.

On-snow performance

Uphill efficiency: At 170 g, every step feels easier. The free-pivot tech toe makes for a natural stride. The 41 mm heel riser is simple and effective on sustained climbs.
Transitions and usability: The “Too Facile” toe eases step-in, even in cold, windy transitions. A 20 mm heel track helps with boot changes or sole variances. Optional crampon slot and touring stoppers add versatility.
Downhill feel: Fixed RV 8 provides predictable, direct energy transfer. Like most race-weight tech bindings, elastic travel is limited; in chattery snow the binding can feel taut compared to models with more elasticity. No integrated brake—use leashes or add optional stoppers.

Durability and materials

CNC‑machined from a single block of 7075 aluminum with steel pins and hardware at critical points. Few moving parts mean low maintenance and reliable longevity. Made in the French Alps.

Comparisons

Dynafit Superlite 150/175: Similar or lighter weight and typically adjustable lateral RV, plus optional brakes. More versatile for mixed touring, but more parts and complexity.
ATK Trofeo Plus: Even lighter (~145 g) and equally minimal. Release often managed via swappable U‑springs; still brakeless. The S 170 feels stout, adds a 20 mm length adjustment.
Plum Oazo 8: Heavier (~203 g) with more comfort (multiple heel risers, adjustable lateral RV). Better all‑round touring; S 170 wins on pure minimalism.

Pros and cons

Pros: 170 g ultralight; precise power transfer; easy step‑in; 20 mm adjustment; optional stoppers/crampons; durable 7075 alloy.
Cons: Fixed RV 8 (not adjustable); no integrated brakes; limited elasticity; single high heel riser; less ideal for wide skis/aggressive freeride.

Key takeaways

Ultralight minimalism for maximum climbing efficiency and fast transitions.
Fixed release is simple and consistent but not tailor-fit to every skier.
Best on light to mid‑width touring skis up to ~100 mm with leashes or optional stoppers.

Specs explained

Type of binding – Tech (frameless pin touring): Pins engage boot inserts for the lightest stride and efficient uphill travel.
DIN/release value – 8 (fixed, lateral and vertical): Simple, predictable release; you can’t fine‑tune to body weight or preference.
Elastic travel – Not specified: Less “reserve” for harsh hits than hybrid/alpine designs; can feel firmer in variable snow.
Brake width – No brake (optional 80/90/100/110 mm): Lightest configuration; add stoppers for security on hardpack.
Weight – 170 g (single), 340 g (pair): Reduces fatigue, improves pace—especially on big vert days.
Compatibility – Tech/Low‑Tech inserts; skis up to ~100 mm; Plum crampons: Works with pin‑insert boots; width guidance keeps forces in range.
Materials – 7075 aluminum, steel pins: High strength‑to‑weight and wear resistance with minimal grams.

Frequently asked questions

Q: Can I add brakes to the Plum S 170?
A: Yes. Plum Touring Stoppers (about 80/90/100/110 mm) are optional. Expect added weight and a touch more complexity, but better retention on firm snow.

Q: Is RV 8 the same as DIN 8?
A: RV is the tech-binding equivalent of DIN but not an identical certification. Feel varies by boot/binding combo. Have your setup checked and consider leashes or stoppers.

Q: What skis pair best?
A: Light to mid‑width touring skis up to ~100 mm. For wider skis or aggressive freeride, look to a binding with brakes and adjustable RV.