Sidekick Rear MTB Hub
SKU:HB5UKA-204
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Sidekick is the only hub that simultaneously eliminates pedal kickback, delivers near-zero freewheeling drag, and runs near-silently when coasting. Built for trail, all-mountain, enduro, and E-MTB riders, the Sidekick Rear MTB Hub unlocks the complete performance hub advantage at a price within reach of every rider.
The pusher-activated magnetic pawl mechanism fully decouples the drivetrain from the rear suspension during coasting. The result is a rear end that moves freely through its travel without fighting chain tension: better small-bump compliance, more traction on rough terrain, and a ride that feels effortlessly fast off corners. BYB Telemetry testing shows up to 44% more time spent in the optimal 11–70% suspension travel range.
The tool-free adjustable deadband gives you three distinct settings changeable trailside in seconds. At 9°, engagement is fast and direct, comparable to a conventional hub, ideal when climbing is the priority. Open it up to 13° or 18° for maximum anti-kickback and suspension performance on descents. The 17mm 7075 alloy axle delivers 50% more stiffness than the previous generation, at 300g (Boost 148mm) or 310g (157mm DH, Superboost).
- Eliminate pedal kickback full drivetrain isolation during coasting; suspension works as designed
- Near-zero freewheeling drag at least 55% less coasting drag than competing hubs in controlled tests
- Near-silent operation hear your tires and terrain, not your hub
- Tool-free deadband adjustment 9° / 13° / 18°; narrowest setting delivers quick engagement for climbing, wider settings maximize anti-kickback performance
- 300g (Boost 148mm) competitive with the lightest conventional hubs on the market, while unlocking massive performance benefits
- 17mm alloy axle, ASTM 5 rated at 150kg
- XD, HG, and Microspline driver compatibility 148mm (Boost) and 157mm (DH, Superboost)
- 6-Bolt disc mount, 28h and 32h spoke configurations
- E-MTB compatible reduces drivetrain clatter from motor torque pulses
- 10-year warranty with lifetime bearing coverage, fully rebuildable, designed for extended service
Pair with the Sidekick Front MTB Hub to complete the build.
Axle
Drilling
e-Bike Compatible
Engagement
Freehub Mount
Mount
Spokes/Nipples
Weight
148x12mm Boost, HG 300g
148x12mm Boost, Microspline 300g
157x12mm Superboost, XD 310g
157x12mm Superboost, HG 310g
157x12mm Superboost, Microspline 310g
Guaranteed to be free from defects in materials or workmanship for 5 years after original purchase
Sidekick Hubs
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What is Sidekick?
The Sidekick Hub by e*thirteen is a revolutionary rear mountain bike hub designed to enhance suspension performance by eliminating pedal kickback and filtering chain vibration.
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How does Sidekick Work?
A proprietary freehub mechanism disengages the drivetrain from the rear wheel when coasting, and an adjustable engagement deadband filters kickback and chain vibration before it reaches the pedals, isolating all pedal feedback from the suspension.
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What is Pedal Kickback?
Pedal kickback occurs when suspension movement applies tension to the chain, causing unwanted pedal movement and compromising suspension performance.
Sidekick Flux Wheels
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What is Flux?
Inspired by the legendary strength and durability of our LG1 Race rims, our riders called for discipline-specific DH and Enduro rims that pair our historic resilience with a more forgiving and compliant ride. The Grappler Flux Rim is our response: a masterpiece of engineering designed to deliver the robustness racers trust, with enhanced ride quality for peak performance and comfort.
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How are Flux rims different?
Grappler Flux rims are a fusion of unique low-profile rim sections materialized in high-modulus carbon fiber or 6069-AL, meticulously engineered for the ultimate balance of strength and compliant, controlled ride feel. These innovative rims redefine performance in mountain biking, offering a new dimension of durability, ride quality, and comfort.
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Who is it for?
Tailored for the competitive racer and the passionate enthusiast alike, Grappler Flux rims are available in Enduro and DH variations. Grappler Sidekick Flux wheels come in all popular axle configurations and are suitable for class 1 e-bike use. They’re the ideal choice for riders who challenge the limits of speed and agility on fast, aggressive tracks and trails while desiring more comfort, reduced fatigue, and enhanced traction.
