Merida Reacto 4000

Merida Reacto 4000 2026 Road Bike

The Reacto 4000 combines aerodynamic efficiency with everyday rider comfort. A CF3 carbon frame, Shimano 105 12-speed groupset, and powerful hydraulic disc brakes make it a fast, well-balanced aero bike for racing or spirited rides.

Key Features

CF3 IV carbon aero frame with race-proven geometry, Disc Cooler technology
Reacto CF3 IV Disc full carbon fork
Shimano 105 12-speed drivetrain with 52/36T chainset, 11–34T cassette
Shimano 105 hydraulic disc brakes, 160mm rotors
Merida Expert CW wheels with Continental Grand Prix 28mm tyres
Integrated carbon seatpost with aero shaping
Internal cable routing and clean aero design details
Available with 0% APR finance
 

The Merida Reacto 4000 is designed to deliver speed, control, and efficiency, making it an excellent choice for riders entering road racing or wanting a high-performing aero bike. Built around a CF3 carbon frame, it shares the same aerodynamic shaping and geometry as Merida’s top-tier CF5, but with a more accessible carbon lay-up. The result is a frame that is both lightweight and stiff, with race-focused handling and aero features developed using Computational Fluid Dynamics (CFD) for real-world performance.

Comfort has been carefully built in. The Reacto 4000 accommodates up to 30mm tyres and comes equipped with Continental Grand Prix 28mm tyres, balancing speed with extra cushioning for longer rides. Merida’s Disc Cooler technology reduces brake temperatures by up to 35%, ensuring consistent braking power on long descents. The clean integration of the calipers within the frame further reduces drag while improving aesthetics.

The groupset is a full Shimano 105 R7100 12-speed system, offering precise and dependable shifting. A semi-compact 52/36T chainset paired with an 11–34T cassette gives you the range for flat-out efforts as well as hilly routes. Braking is handled by Shimano 105 hydraulic disc brakes with 160mm rotors, delivering controlled stopping power in all conditions.

Rolling on Merida Expert CW wheels with a 30mm depth, the Reacto 4000 strikes a balance between aero gains and stability in crosswinds. The wheels are fitted with Continental Grand Prix tyres for reliable grip and low rolling resistance. Merida’s aero-shaped Team CW carbon seatpost further complements the bike’s aerodynamic focus, while the inclusion of a Merida minitool adds practical utility.

Whether you’re pinning on a number for your first race, pushing the pace on club rides, or chasing your personal bests, the Reacto 4000 brings WorldTour-inspired aero technology into a package that’s both accessible and versatile. It’s a bike that proves you don’t need to compromise between speed, comfort, and control.