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Wheel(s) DUKE LUCKY JACK SLS5 32"/ DUKE CORE IS SP
From 1233 g* in 32-inch format. Lucky Jack SLS5 32” is designed to take advantage of the larger diameter’s improved rollover and stability, as well as its ability to carry momentum more effectively, without accepting a heavy or sluggish wheel.
At the front, Lucky Jack 32 is available in two versions depending on the level of commitment:
- i31 mm – 360 g (XC)
- i31 mm – 400 g (demanding XC)
At the rear, we recommend the i29 mm – 410 g version for two reasons:
- this version features more generous AntiPinch rim edges, helping to further reduce the risk of pinch punctures;
- the differentiated front/rear internal widths (31 mm at the front and 29 mm at the rear) match our 6TERS recommendation.
The i31 mm – 400 g version can nevertheless also be used at the rear.
Key processes & technologies:
- 32-inch carbon architecture specifically recalibrated for the demands of the larger diameter.
- Internal width optimised for modern MTB tyres**.
- SLS5: optimised carbon lay-up and aerospace-grade resin.
- SpokeCore: moulded spoke holes (28h) for a more homogeneous structure.
- ImpactGuard: energy-absorbing inserts integrated into the rim.
- VFP: clearcoat-free finish, more durable and more environmentally friendly.
- DRC: controlled vertical deformation and rebound for more grip, comfort and precision.
- AntiPinch / AntiBurp: protection against tyre cuts and enhanced tyre retention under cornering loads.
- 4 mm Offset: asymmetric spoke bed to balance spoke tension and improve lateral stiffness and reliability.
- Hookless / Tubeless Ready: architecture suited to the low tyre pressures of XC.
Result:
A fast, stable and compliant 32-inch XC platform, designed for riders who want the benefits of the larger diameter without giving up the dynamic character of Lucky Jack.
* Weight +/- 30 g for an RC-1 Edition wheelset, with DUKE MadMax3 Boost R55 hubs and Sapim RC-1 PBO spokes.
** Optimal tyre width: 2.2” <> 2.4”. Compatible tyre width: 2.1” <> 2.8”.
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Technology
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SLS2 Super Light Serie 2
SLS5 (Super Light Series 5)
An exclusive manufacturing process combining an optimized carbon fiber lay-up with aerospace-grade resin
- 10% lighter than the previous SLS4 generation
- 15% more controlled vertical compliance for enhanced ride dynamics
- Increased resistance to lateral loads and vertical impacts
- Better vibration filtering for improved comfort and control -
DRC (Dynamic Response Comfort)
DRC (Dynamic Response Comfort)
Controlled vertical flex and rebound
- More dynamic handling during weight transfers and bermed corners
- Increased comfort on rough terrain
- Reduced energy loss, more speed and efficiency -
SpokeCore
SpokeCore
Molded spoke holes that eliminate the need for drilling
- Preserves carbon fiber integrity
- Reinforces the structure
- Allows for precise control of vertical and lateral stiffness
- Reduced weight and increased reliability -
ImpactGuard
ImpactGuard
Integrated energy-absorbing inserts
- Absorbs both low and high-intensity impacts
- No added weight
- Fully integrated into the rim structure to increase durability -
Width
Optimized Internal Width
Maximizes tire volume and performance
- Enables lower pressures without sacrificing rolling efficiency
- Controls tire deformation for greater stability
- Improves control and comfort on all terrains -
VFP (Varnish Free Process)
VFP (Varnish Free Process)
A varnish-free finish process
- Reduces VOC emissions and carbon dust during production
- More scratch-resistant surface
- Naturally glossy finish -
Offset
OFFSET
Asymmetrical spoke lacing
- Balances spoke tension on both sides
- Improves lateral stiffness, stability, and long-term durability
- No added weight -
Hookless
HOOKLESS
Hookless rim design
- Lighter than traditional hooked rims
- Increases the tire’s internal air volume, boosting comfort and grip at lower pressures
- Proven DUKE technology since 2011 -
AntiBurp
AntiBurp
Anti-burp and anti-debeading system
- Specially designed inner rim hooks lock the tire beads securely
- Eliminates air loss under heavy cornering or compression
- Prevents tire debeading, even in the event of a puncture -
Anti-pinch
AntiPinch
Anti-pinch rim bead design
- Prevents tire cuts from hard impacts
- Dissipates shock energy
- Allows low-pressure riding without pinch-flat risks -
Tubeless Ready
Tubeless Ready
Tubeless-compatible rim design
- Compatible with UST and Tubeless Ready standards
- Also compatible with tube-type (clincher) setups
Sapim Spokes
Sapim is THE go-to spoke brand, manufactured in Belgium since 1918. Several spoke models are available, depending on compatibility with your riding style and chosen rim:- Sapim CX-Ray: flat spoke, very light, durable, aerodynamic, and offers a very dynamic ride feel (309g / 64 pcs / 292mm)
- Sapim CX-Sprint: flat spoke similar to the CX-Ray but thicker for even more stiffness (373g / 64 pcs / 292mm)
- Sapim D-Light: round spoke, light and durable, with a central section diameter of 1.65mm, good value for money (344g / 64 pcs / 292mm)
- Sapim Race: round spoke, strong and stiff with a central section diameter of 1.8mm (408g / 64 pcs / 292mm)
Nipples
Aluminum nipples with locking thread, available in 16 colors: black, red, silver, metallic grey, blue, aqua blue, gold, light gold, dark green, mint syrup green, lime green, lilac, pink, fuchsia pink, orange, and oil slick.
Accessories
The wheels are delivered fully assembled with valves and rim tape installed, four spare spokes and nipples, and an assembly certificate.
All Duke by JPRACINGBIKE1 wheels are assembled by hand in Vendée, France.
Crash replacement
We offer a crash replacement programme for carbon wheels. In case of accidents or heavy falls, violent shocks can damage your rim and make it impossible to use. With our Crash Replacement offer we offer you a service that allows you to replace your rim under special conditions: You get a 50 percent discount on the price of UD carbon & 3k Carbon rim, as well as the parts and the disassembly/reassembly. This offer is valid (for life) for an unlimited period of time for DUKE carbon rims and is transferable in the event of sale of the wheels to a third party.
Brand
DUKE CORE
Supplier info
LJ-SLS5-BRIS-SP
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