Sunn Radical
The iconic bike of an emblematic brand
Unveiled as a preview during the World Cup in Loudenvielle in September 2024, the new Radical mountain bike was officially launched by Sunn in March 2025. The latest bike inherits the kinematic architecture of its older brother, the Radical +, an emblematic downhill competition bike from the 1990s. For this new project, Antidote Solutions worked closely with Sunn’s R&D team throughout 2023.
A radical without knowing it
In 2023, Sunn reached Antidote Solutions to develop a 100% enduro mountain bike. The technical specifications came with two key elements: performance and versatility.
“At the beginning of the project, we aimed to develop a new version of the Kern, our flagship enduro mountain bike”, explains Serge Lopez, the R&D Product Manager at SUNN. “But as the design process progressed, with its modern look and strong focus on performance, it became clear we were designing a new-generation Radical bike.”.
Geometry, kinematics and fine-tuning
Antidote Solution collaborated closely with Sunn’s engineers on geometry, kinematics, and development. In February 2024, a field testing session was organised at Mont Bouquet (Gard department), featuring test driver Simon André, Fred Bernard and Nathan Ducrocq representing Antidote Solutions, and Elie Beauvais supervising for Sunn.
According to Serge Lopez, the goal was to “test the calibration, suspension, and chassis stiffness. I wanted to ensure that our integrated design office at Sunnesucceeded. The tests conducted by Antidote Solutions allowed us to receive feedback from external experts. It was essential for us not to be judge and jury.”
A result that radically performs.
This new mountain bike offers a great balance between the current design codes and the Radical DNA, which makes it immediately recognisable. When we asked Fred Bernard what makes this bike so special, he answered: “A downhill-capable enduro bike.” He highlights three key features of the new Radical Enduro :
- Kinematic architecture with a high pivot point and low rocker arm
- Low centre of gravity for greater stability
- Dynamic criteria to enhance grip and to ease handling
Sunn Radical Project
The segments in which we have operated
Brand Strategy – Product Strategy
market studies for brand and product
brand positionning
“go to market” strategy
brand indentity and communication
Engineering
technical design
3D modeling
FEM analysis
product management and component sourcing
bills of materials (BOM) and technical reports
Prototyping and fine-tuning
prototyping supervision
shakedown and initial proof testing
“on field” testing
fine-tune set up
Industrialisation
manufacturing process
production engineering
supply chain set up
product certification support
manufacturing supervision