DUKE 28" Gravel Sierra 27 SLR5 Asymmetrical Rim | 24-Hole
With the Sierra series, Duke is ushering in a new era of gravel rims. Lighter, more comfortable, and yet more durable than their predecessors, the French manufacturer is once again pushing the boundaries of physics without compromising performance.
Particularly striking is the increased inner width, now at 29 mm. This has become the standard and allows wider tires to take on a better shape, resulting in more grip and greater comfort. This also has a positive effect on aerodynamics. Thanks to the excellent craftsmanship and high-quality materials, the rims are certified for a system weight of 105 kg and can therefore also be used for lightweight bikepacking. Duke has once again opted for a rim flange with a hook to ensure the tire always sits securely, even at high air pressures. Additionally, the anti-pinch construction prevents the rim from being pinched and damaged during hard impacts.
As usual, the Sierra models also feature an asymmetrical rim profile, which allows for a more uniform spoke angle. This optimization of the spoke angle offers a variety of benefits. Spoke tension on both sides can be better balanced, which contributes to the durability of the spokes and the entire wheel. Lateral stiffness, which is normally direction-dependent, is also balanced, making the wheel more stable overall.
The Sierra 27 is particularly at home on challenging mountainous terrain, where low weight plays a more important role than aerodynamics.
SLR5 (Super Light Road Series 5) – Process
In addition to the exclusive Toray T1100 carbon fibers, the SLR5 manufacturing process is largely responsible for the rim’s high-quality appearance. Thanks to the optimized carbon laminate, only as much material as is needed at specific points is used, without compromising functionality. This has reduced the weight by approximately 20% compared to the SLR2 rims. Furthermore, post-processing or painting during the production process is no longer necessary. This not only saves energy but also ensures a scratch-resistant surface and a natural, glossy appearance.
DRC (Dynamic Response Comfort) Technology
Another interesting feature is the integrated DRC (Dynamic Response Comfort) technology. This ensures controlled vertical flexibility and rebound of the rim on rough terrain. This significantly improves rider comfort, and the stored energy can also be harnessed for explosive acceleration.
Molded spoke holes
To avoid compromising the stability of the carbon fibers, the spoke holes are not drilled as is customary, but are instead formed during the layering of the individual mats. This preserves the fiber structure and eliminates weak spots in the rim from the outset. In addition, vertical and lateral stiffness can be better controlled at these points.
3-Year Warranty and Lifetime Crash Replacement on UD Carbon Rims
Duke selects the materials used with great care to offer you the best possible product. Therefore, the quality standards for all products, subcontractors, and partners are very strict. Duke guarantees for a period of two years that the rims offered are free of hidden defects. However, the warranty is void in the event of improper installation or use of the products.
In the event of accidents or serious crashes, severe impacts can damage the rim and render it unusable. That’s why Duke offers a lifetime crash replacement for its UD-carbon rims. As part of this program, you’ll receive a 50% discount on the rim you purchased when you exchange it.
Technical Specifications:
Intended Use: Gravel
Material: Toray T1100 carbon
Rim type: Clincher (spoked and folding tires)
Brake type: Disc brakes only
ETRTO: 622x29
ERD: 590 mm
Inner width: 29 mm
Outer width: 34 mm
Rim height: 27 mm
Offset: 2.0 mm (asymmetrical)
Number of holes: 24
Tubeless-compatible: Yes
ASTM classification: N/A
Recommended tire width: 36 to 61 mm, aerodynamically optimized for 40–55 mm
Maximum tire pressure: 3.4 bar with a 44 mm tire width
Maximum system weight: 105 kg (rider, bike, clothing, and any luggage)
Maximum spoke tension: 1200 N
Features: SLR5 technology, DRC (Dynamic Response Comfort) technology
Valve hole diameter: 6 mm (SV), recommended valve height: 44 mm
Finish: UD carbon, satin
Color: black
Manufacturer's weight: 280 g
Weight (measured by us): -
Package contents: 1x DUKE 28" Gravel Sierra 27 SLR5 asymmetrical rim | 24-hole
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