Dynafit Speed Radical – Review

Dynafit’s Speed Radical is a no‑frills, lightweight tech touring binding aimed at skiers who prize uphill efficiency and dependable downhill control without the weight or complexity of brakes. With adjustable lateral and vertical release (DIN 4–10), Step‑In Side Towers, and a clean brakeless setup, it’s a proven platform for long days in the backcountry.

Who is it for?

Ski tourers and ski mountaineers focused on big vert and fast travel.
Minimalists who don’t want brakes and value simplicity.
Skiers using tech‑compatible boots with a release need in the 4–10 range.

On‑snow performance

Climbing: The low mass and Speed Step heel risers make quick work of steep skintracks. Step‑In Side Towers noticeably speed up toe entry and reduce fiddling in cold or windy transitions.
Descending: For a classic brakeless tech binding, damping is predictable and confidence‑inspiring when skied with good technique. Release is fully adjustable, but as expected there’s no pronounced “alpine‑style” elastic travel; ski it with precision in variable conditions.

Features that stand out

Step‑In Side Towers: Guide the boot toe into the jaws for easier, more secure step‑in.
Speed Step climbing aid: Multi‑position heel risers for efficient ascents.
Ice‑Breaker pins: Help shed ice build‑up at the toe piece.
25 mm heel length adjustment (±12.5 mm): Useful for quiver sharing or boot changes.
Crampon slot: Compatible with Dynafit crampons for firm, icy traverses.
Brakeless with leash included: Keeps weight low and the ski streamlined.

Specs explained

Type of binding: Tech (Alpine Touring) – Pin/tech interface for efficient touring and low weight.
DIN/release: 4–10 – Adjustable lateral and vertical release; best for light to medium riders or technically minded skiers.
Elastic travel: Not specified – Dynafit doesn’t publish dynamic travel here; expect a classic, direct tech feel rather than cushy alpine‑like elasticity.
Brake width: Brakeless – No integrated brakes; you’ll use the supplied safety leash. Saves weight but requires thoughtful use.
Weight: 340 g per binding – Very light for long days; most pairs fall ~680–740 g.
Compatibility: ISO 9523 tech boots – Requires tech inserts; not compatible with ISO 5355 alpine boots.
Materials: Aluminum, stainless steel, high‑tech synthetics – Durable with a strong stiffness‑to‑weight ratio.

Comparisons

Marker Alpinist 10: Lighter and commonly run with brakes; feels a touch more progressive, while the Speed Radical wins on step‑in ease and bombproof simplicity.
Salomon MTN/Atomic Backland: Similar weight and reliability; Speed Radical adds generous 25 mm heel adjustment and notably easy entry.
G3 ZED 9/12: Heavier with optional brakes and more features; more complexity versus the Speed Radical’s minimalist ethos.
ATK Raider series: More downhill performance options (e.g., freeride spacers) at higher cost and often more weight.

Drawbacks and watch‑outs

No brakes: Leashes demand discipline and awareness of avalanche and runaway risks.
Limited DIN (4–10): Heavy or very aggressive skiers may want a higher‑range binding.
No published elastic travel: Less forgiving than freeride‑oriented touring bindings in hard compressions.

Mounting and setup notes

Have a pro mount them; follow Dynafit’s heel gap spec and torque settings.
Set DIN/release values to your profile and perform a functional check.
Practice step‑in with the Side Towers and switching heel risers with a pole.

Frequently asked questions

Q: Is brakeless skiing safe?
A: Brakeless with a leash is common in touring but requires extra care in avalanche terrain and on firm pistes. Use the leash wisely and be aware of runaway‑ski risk.

Q: Can I add brakes to the Speed Radical?
A: The Speed Radical is designed to be brakeless. There is no standard Dynafit brake for this model; third‑party solutions are limited and not broadly recommended.

Q: What boots are compatible?
A: Tech/insert touring boots (ISO 9523) with toe and heel inserts. Alpine ISO 5355 boots are not compatible.

Q: How does it compare to the braked Dynafit Radical/Rotation?
A: ST Radical/Rotation models add a rotating toe and brakes, with more weight and a more downhill‑oriented feel. The Speed Radical stays lighter and simpler for pure touring.

Key takeaways

Lightweight efficiency for long tours.
Step‑In Side Towers genuinely speed up transitions.
Brakeless minimalism saves weight but adds responsibility.
DIN 4–10 targets light to medium riders/technical skiers.

Verdict

The Dynafit Speed Radical is a trustworthy, efficient tech binding for big‑day touring. It combines low weight with user‑friendly details and proven durability. If you don’t need brakes and fit within DIN 4–10, it’s an excellent, cost‑effective choice for dedicated tourers.