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Wheel(s) DUKE SIERRA 42 / BARON CL SP BERD
From 1220 g* of controlled speed. Sierra 42 is our efficiency-focused Elite carbon gravel wheelset, developed for riders who want to hold a high pace on fast tracks and rolling courses.
It combines a 42 mm profile, 28 mm internal width and controlled vertical stiffness to filter vibrations, preserve grip and prioritise efficiency on fast terrain.
Key processes & technologies:
- 28 mm internal width optimised for modern gravel tyres**
- SLR5: advanced lay-up of Toray T1100 carbon fibres and aerospace-grade resin
- SpokeCore: moulded spoke holes (24h) for a more homogeneous structure
- VFP: clearcoat-free finish, more durable and more environmentally friendly
- DRC: vibration filtering for increased comfort and precision
- AntiPinch: anti-pinch rim beads to help prevent tyre cuts on impacts
- Offset: asymmetric lacing for more balanced spoke tension and improved lateral stiffness and reliability
- Hooked / Tubeless Ready: optimum safety and compatibility with modern tyres
Result:
A fast, stable and confidence-inspiring Elite gravel wheelset, made to hold speed, keep grip and accelerate efficiently on rolling terrain.
* Weight +/- 30 g for a wheelset built with NonPlus CL SP hubs and Sapim CX-Ray spokes.
** Optimal tyre width: 40 mm <> 2.2". Compatible width: 36 mm <> 2.4".
- CONFIGURATEUR
- SPECIFICATIONS
- TECHNOLOGIE
- SERVICE
CONFIGURATEUR
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With :
Front wheel
Back wheel
Product customization
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Fast delivery and careful
International delivery
Delivery by Chronopost
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SPECIFICATIONS
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.
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.
TECHNOLOGIE
Technology
-
SLR5 (Super Light Road series 5)
SLR5 (Super Light Road series 5)
Exclusive manufacturing process combining optimized carbon fiber layup and aerospace-grade resin
- On average 20% lighter than the SLR2 generation
- Increased resistance to lateral stresses and vertical impacts
- Better vibration filtering for increased comfort and control -
Hooked
Hooked
Hooked rim design
- Optimized for road and gravel tire pressures
- Ensures secure bead retention
- Wider internal width offers aerodynamic benefits -
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 -
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 -
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 -
Tubeless Ready
Tubeless Ready
Tubeless-compatible rim design
- Compatible with UST and Tubeless Ready standards
- Also compatible with tube-type (clincher) setups
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