DUKE RIM FURY JACK SLS5 REAR

New DUKE Gravity Range — Fury Jack SLS5
FEATHERWEIGHT. HEAVY-HITTING.

Maximum strength for Gravity & E-MTB use:
Fury Jack: Enduro / DH / Aggressive E-MTB
Aluminum is no longer your only Gravity/E-MTB option
Integrated 6TERS concept:
Asymmetric internal width for terrain-optimized performance:
Front: 33 mm – Grip & control
Rear: 31 mm – Stability & strength
Optimized weight:
Crazy Jack rims: 355 g (33 & 31 mm) Fury Jack rims: 420 g (33 mm) / 460 g (31 mm)
SLS5 carbon layup technology:
10% lighter than previous SLS4 generation
15% more vertical compliance for improved riding dynamics

ImpactGuard and SpokeCore innovations
Stronger. Smoother. Snappier. Time to send it.

No Mercy
Proven at the highest level, our Fury Jack wheels take on the world’s roughest courses: EDR World Cup, E-EDR World Championships, E-Bike World Tour, and the legendary Megavalanche in Alpe d’Huez.
Riders like Rémi Absalon, Hugo Pigeon and Emeric Lenzer (Moustache SR Suntour E-Team) push them to the limit. Their feedback helped us fine-tune the rims’ ride feel to deliver what we do best: a wheel that’s strong, responsive, forgiving, and precise. Gravity, uncompromised.
Built for Performance
Our SLS5 (Super Light Series 5) process combines optimized carbon fiber layups with an exclusive aerospace-grade resin.

10% lighter than its SLS4 equivalent.
15% more vertical compliance for better dynamic response.
Increased resistance to lateral stresses and vertical impacts.
Enhanced vibration damping for greater comfort and control.
We’ve also introduced two groundbreaking technologies:
ImpactGuard – Energy-Absorbing Inserts
High-resilience inserts, pressure-injected into hollow cavities on either side of the rim, absorb both low and high-intensity impacts. They offer maximum protection without adding unnecessary weight – their density is comparable to our carbon fiber.
SpokeCore – Molded Spoke Holes

Thanks to an advanced manufacturing process, the spoke holes are directly molded into the rim structure. This eliminates the weaknesses and rigidity alterations often caused by drilling. The result :
a one-piece construction that increases durability, allows for fewer spokes, maintains precise stiffness control, and ensures exceptional reliability.
See below for a full overview of DUKE RACING WHEELS technologies integrated into the Crazy Jack & Fury Jack SLS5.
It’s Going to Pop
In Gravity riding, lighter wheels mean quicker line changes and easier rhythm transitions.
But weight isn’t everything. With DRC (Dynamic Response Comfort) built into the SLS5 process, Crazy Jack and Fury Jack manage deformation and rebound with surgical precision.
What does that mean on the trail?

More responsiveness
Energy stored when entering a corner is unleashed for explosive acceleration out of it.
Better grip
Whether braking or accelerating, power transfer to the ground is optimized. You’ll feel more traction in corners and through technical terrain.
Increased comfort
Less fatigue in your upper body, even on long, demanding rides.
Greater control
Your bike feels calmer and more stable when the terrain gets rough.
Proven reliability
Unlike aluminum, carbon fiber doesn't fatigue under stress. By diffusing force across the rim, it reduces the risk of failure.