SUNN Radical S1 2025 – Metallic Brown
The comeback of a legendary model
The SUNN Radical is back in 2025 with a fully re-engineered version. One of the most iconic bikes of the brand, the Radical made history with numerous competition wins. It now returns to meet the demands of modern enduro racing.
Built to charge downhill while staying efficient on climbs, the Radical S1 balances speed, control, and versatility.
Advanced R&D and unique suspension design
The SUNN development team created a brand-new suspension kinematic based on a single-pivot system with rocker linkage. This setup ensures maximum grip and support under extreme conditions while making every millimeter of travel count.
You get optimal rear travel of 160 mm, tuned for performance and consistency.
Carbon frame and progressive geometry
For the first time, the Radical frame is made entirely of Toray carbon fiber. This allows for improved stiffness at key areas while keeping the overall weight low. The geometry is pushed to the limit for the perfect balance between high-speed stability and agile handling.
The chain dynamics are optimized to allow strong pedaling response and fast acceleration on climbs or technical sections.
Versatility and control in any situation
The rear wheel path has been a key focus, designed to follow terrain smoothly while preserving balance. A chain guide is smartly integrated into the stays for reliable performance.
Braking doesn't compromise suspension action, thanks to a concentric pivot at the rear axle—giving you full control even under hard braking.
Real-world performance
The Radical S1 2025 is silent, stable, and incredibly comfortable. It eats up obstacles without hesitation and maintains speed with ease. Surprisingly nimble for its category, it's responsive in tight turns and built to race fast enduro stages.
Still under final tuning with pro riders, the Radical will hit the trails in early 2025 with even more speed and refinement.
Key technical specs
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Frame: Toray full carbon, 160 mm travel
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Fork: RockShox ZEB Rush RC, 170 mm
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Shock: RockShox Super Deluxe Select, 205 x 60 mm
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Drivetrain: Shimano XT/Deore 12-speed
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Brakes: Formula Cura 2, 220/203 mm rotors
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Wheels: e*thirteen LG1+ 29"
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Tyres: Michelin Wild Enduro MS Racing Line 29x2.40
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Dropper post: Brute Dropper (130–170 mm depending on size)
See photos for full geometry details.
