DT Swiss FR 541 - Onyx Racing Vesper Custom Wheelset Builder

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DT Swiss FR 541 Aluminum Rim

The DT Swiss FR 541 is a high-performance aluminum mountain bike rim built for riders who push their wheels hard. Designed specifically for freeride, downhill, bike park, and aggressive enduro riding, the FR 541 combines serious impact resistance with a relatively lightweight construction to create a dependable foundation for a hard-hitting custom wheelset.

DT Swiss redesigned the rim profile to improve durability and resistance to hard impacts while also increasing protection against pinch flats. Testing conducted with a leading tire manufacturer showed a 17% improvement in pinch-flat resistance compared to the previous-generation FR 560.

The FR 541 features a 30mm internal width, providing excellent support for modern aggressive mountain bike tires and allowing riders to run lower tire pressures for additional traction and control on rough terrain.

A welded aluminum construction provides a strong and precise rim joint, while DT Swiss’ PHR washer system increases the load-bearing surface around each spoke nipple. This helps distribute spoke forces across a larger area of the rim and reduces localized stresses for a strong, reliable wheel build.

Available in both 27.5” and 29” sizes, the FR 541 is also an excellent choice for mixed-wheel/mullet setups.

 

Key Features

 

• Heavy-duty aluminum construction

• Designed for freeride, downhill, bike park, and aggressive riding

• 30mm internal rim width

• 35mm external width

• Tubeless-ready tire interface

• Improved impact resistance

• 17% greater pinch-flat resistance compared to the FR 560

• Strong welded rim joint

• DT Swiss PHR washer system for improved spoke-load distribution

• Available in 27.5” and 29”

• 28- and 32-hole options available

• 570g claimed weight – 27.5”

• 605g claimed weight – 29”

• ASTM Classification 5

• Maximum system weight: 140kg / 309lb

• E-bike approved

 

Built for riders who hit harder, ride faster, and need a wheelset that can take the abuse, the DT Swiss FR 541 is an excellent choice for a durable custom gravity wheel build.

 

Onyx Racing Hubs

Onyx Racing hubs deliver a completely different riding experience with instantaneous engagement, exceptionally smooth rolling, and virtually silent coasting. Designed for riders who want immediate power transfer without the noise or backlash of a traditional ratchet-style hub, Onyx hubs are a premium choice for your custom wheel build.

At the heart of every Onyx rear hub is their patented sprag clutch engagement system. Instead of using conventional pawls and ratchet teeth, the sprag clutch engages immediately when torque is applied, providing infinite points of engagement with zero-degree engagement. The moment you put power into the pedals, the hub responds.

When you stop pedaling, the system freewheels almost silently. With no pawls clicking across ratchet teeth, you get an incredibly quiet ride that lets you hear your tires, suspension, and the trail beneath you.

Onyx hubs also utilize premium-grade bearings designed for low rolling resistance and smooth performance. Their rear hub designs separate drive forces from axle loads to further reduce drag and promote long-term bearing performance.

For mountain bike builds, Onyx offers options ranging from the lightweight Vesper, designed primarily for XC and trail pedal bikes, to the more robust Classic platform for demanding applications, heavier riders, bikepacking, tandems, and e-bikes.

Key Features

• Instantaneous, zero-degree engagement
• Infinite points of engagement
• Patented Onyx sprag clutch technology
• Virtually silent freewheeling
• Minimal drivetrain backlash
• Premium-grade bearings for smooth, low-drag performance
• Strong, serviceable hub construction
• Multiple axle, drivetrain, spoke-count, and brake configurations available
• Options for XC, trail, enduro, e-bike, gravel, road, BMX, and other applications

Choose your Onyx hub configuration to build an exceptionally smooth, responsive, and quiet custom wheelset.

 Please allow 2-3 weeks for your custom wheels to be assembled, packed and heading your way!