CANNONDALE SYNAPSE 2025 Test, Review, First Driving Impressions of Professionals, Review, Strengths, Weaknesses, Problems, Performance, Opinions: Everything You Need to Know (Really)
In-Depth Technical Analysis and First Impressions of the 2025 Cannondale Synapse
Introduction:
A detailed technical analysis of the new 2025 Cannondale Synapse is presented, integrating the available information with engineering and biomechanical considerations. The goal is to provide an objective assessment of the declared technical characteristics and the first riding impressions.
Frame and Geometry:
The 2025 Synapse frame represents a conceptual evolution that draws on both the high-performance SuperSix Evo platform and the structural flexibility of the SuperX. Note the adoption of a threaded BSA bottom bracket, a standard that facilitates maintenance and offers wide compatibility with different cranksets. The integration of the Delta Steerer, borrowed from the SuperSix Evo, standardizes the steering interface with other models of the brand.
The tube sections feature aerodynamic profiles derived from studies on the SuperSix Evo, suggesting an optimization for the reduction of air resistance. Sharing components such as thru axles, rear dropouts, stems and an aero seatpost with the SuperSix Evo means a strategy of standardisation and potential cost containment.
Maximum tyre clearance has been increased to 42 mm, with all models coming standard with 32 mm tyres. This, combined with the provision for mudguards and the integrated storage compartment in the down tube, indicates a design oriented towards greater versatility of use, extending the potential of the bike beyond pure asphalt.
The frame geometry has undergone modest changes. The head angle has been reduced to 71.5 degrees (from the previous 73 degrees), a change that, combined with the increase in tyre section and the consequent increase in wheelbase and trail, suggests greater stability and control, especially on uneven surfaces. The lengthening of the chainstays to 43 cm (from the previous 41.5 cm) is a direct consequence of the need to accommodate wider tires while maintaining adequate clearance. The increased trail to 61 mm (from the previous 59 mm) aligns the Synapse with endurance models focused on comfort and stability.
The design of the seat tube, with a tapered and flattened section, recalls solutions adopted on the SuperX, suggesting a vertical compliance aimed at improving comfort. The manufacturer claims a 20% increase in overall vertical compliance compared to the previous model, together with an improvement in torsional stiffness at the level of the head tube and bottom bracket, parameters crucial for pedaling efficiency and steering precision.
Aerodynamics:
A focus on aerodynamics was a central element in the development of the new design. Reference is made to the application of principles derived from the SuperSix Evo, including the integration of the cockpit and the use of truncated airfoils for the frame tubes. The design philosophy places emphasis on aerodynamic efficiency as the primary factor in speed, with bike weight secondary to rider weight.
Claimed Weights:
Claimed frame weights are under 1,000g for the Hi-Mod, 1,150g for the standard Carbon, and 900g for the Lab71. Claimed fork weights are 445g for the Hi-Mod and 494g for the standard Carbon. It is important to note that these figures are for raw frames and may vary based on size and finish.
Drivetrain:
A distinctive aspect is the introduction of a single chainring (1x) configuration on the Lab71 model, equipped with the 13-speed SRAM Red AXS XPLR groupset (10-46 cassette and 40-tooth chainring). This choice, unusual for a mass-produced road bike, reflects a trend observed in specific professional contexts and could offer advantages in terms of simplicity, weight and potential use on mixed terrain.
SmartSense system:
The integrated SmartSense system has been revised and improved. The new version features a more compact and powerful front light (800 lumens, 400 for the STVZO versions), integrated more elegantly under the stem. The rear light/radar has been miniaturized.
The central battery, with a capacity of 43.5 Wh, is housed in the storage compartment of the down tube, along with tool bags and an integrated flashlight. This battery also powers the AXS electronic shifting on SRAM models. Charging can be done via USB-C port or by removing the battery. There is integrated protection for the operation of the shifting in the event of a low battery, with a declared power reserve higher than that of a standard SRAM AXS battery at 5% of charge remaining.
SmartSense is available on all SRAM-equipped versions, while the Shimano versions (both electronic and mechanical) do not integrate this system. SmartSense components will also be available for separate purchase.
First Ride Impressions:
Based on the geometry changes and the technical features implemented, some first ride impressions can be inferred:
Stability and Control: The slacker head angle and increased trail should translate into greater directional stability, especially at high speeds and on rough surfaces.
Comfort: The claimed increase in vertical compliance of the frame and the increased tire clearance suggest improved ride comfort over long distances and on uneven terrain.
Versatility: The ability to mount tires up to 42 mm and the presence of mudguard predispositions broaden the spectrum of use of the Synapse, making it potentially suitable for light gravel routes and use in adverse weather conditions.
Aerodynamic Efficiency: The adoption of aerodynamic profiles derived from the SuperSix Evo suggests an improvement in efficiency at high speeds compared to the previous model.
SmartSense Features: The updated SmartSense system appears to offer better integration and functionality, with a focus on safety thanks to the more powerful front light and rear radar.
Potential Pros:
Increased versatility thanks to the large tire clearance and provision for mudguards.
Improved riding comfort thanks to the greater vertical flexibility of the frame.
Potential increase in stability and riding control.
Aerodynamic optimization for greater efficiency.
Integrated and improved SmartSense system for safety and functionality.
Available in different configurations and price levels.
Potential Flaws and Problems:
The SmartSense system, while improved, could still represent an element of complexity for some users.
The choice of a single chainring drivetrain on the Lab71 model may not be ideal for all cyclists on predominantly road routes with steep gradients.
The actual weight of the complete bicycle may differ from the weights declared for the frames.
The advanced integration of some components may complicate maintenance or replacement with non-original spare parts.
Performance:
The performance of the 2025 Synapse should be positioned as a compromise between the agility and reactivity of a pure racing bike and the comfort and stability of an endurance bike. Good absorption of vibrations and roughness of the terrain is expected, together with a decent efficiency in pedaling, especially on the models with Hi-Mod frames. Improved aerodynamics could offer advantages in terms of cruising speed.
Opinions and Reviews:
The first reactions and reviews, although not yet based on in-depth independent tests, seem to indicate a positive evolution of the Synapse platform. The emphasis on versatility and comfort, combined with a design that harks back to the brand’s performance models, could appeal to a wide range of riders. The introduction of a single chainring on the flagship model is a bold move that may divide opinion. The updated SmartSense system appears to have addressed some of the previous model’s niggles.
Bottom Line:
The 2025 Cannondale Synapse presents itself as an evolved endurance bike, with a significant focus on versatility, comfort, and aerodynamics. The geometry changes and the integration of new technology, such as the updated SmartSense system and single chainring option on the flagship model, suggest an attempt to address the needs of an increasingly diverse audience of cyclists.
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