2026 REACTO 4000

Our REACTO 4000 might be the most affordable aero bike in our range, but is far from being an entry-level bike. Featuring our lightweight CF3 frame with race-proven geometry, the 4000 offers impressive comfort due to the generous tyre clearance (up to 30 mm tyres) and the fitted S-FLEX carbon seat post. At the same time, the latest super smooth mechanical 12-speed Shimano 105 groupset keeps shifting in braking and perfect check. This is the ideal aero bike for your first steps into the racing world, as well as challenging club rides.

Unadulterated aero road speed. The latest version of the REACTO took the cycling press by storm. A long string of test wins, perfect scores and awards confirm our successful symbiosis of the race-proven DNA of the previous model with the latest trends and technologies. Cycling Weekly calls it 'without doubt one of the most complete bikes available on the market', Cyclingnews 'an utterly brilliant and faultless machine' and Cycling Plus were 'hugely impressed'. From serious racer via enthusiast to the ambitious road rider, the REACTO is a great bike for many people. Its outstanding aerodynamic performance, reduced weight, sharp handling and super quick acceleration makes it the perfect bike for criterium racers and sprinters. At the same time, the class-leading comfort gives it the ability to play out its aerodynamic advantage also on the cobblestones – or the idyllic but potholed littered lanes of your favorite training ride.

Key Features

• Frame Material: Lightweight CF3 carbon frame

• Bike Category: Aero road racing bike

• Groupset: Shimano 105 mechanical 12-speed drivetrain

• Brake Type: Hydraulic disc brakes

• Tyre Clearance: Supports tyres up to 30 mm

• Seat Post: S-FLEX carbon seat post for improved comfort

• Geometry: Race-proven aerodynamic geometry

• Cable Routing: Clean integrated cable management

• Performance: Fast acceleration and responsive handling

• Ride Use: Ideal for racing, club rides, and endurance training

Product Specifications

• Brand: Merida

• Model: REACTO 4000

• Year: 2026

• Frame: CF3 Carbon

• Fork: Full carbon aero fork

• Drivetrain: Shimano 105 12-Speed

• Brake System: Hydraulic disc brakes

• Wheel Size: 700C

• Tyre Compatibility: Up to 30 mm tyres

• Seat Post Type: S-FLEX carbon seat post

• Color: Matte Black

Aerodynamic Performance

• Aero Frame Design: Optimized tube shaping reduces wind resistance

• High-Speed Stability: Race geometry improves control during fast riding

• Efficient Power Transfer: Stiff carbon frame enhances pedaling response

• Comfort Balance: Carbon seat post helps absorb road vibrations

• Fast Acceleration: Lightweight frame reacts quickly during sprints and climbs

Easy Operation / Usage

• Suitable for road racing, endurance rides, and fast training sessions

• Shimano 105 drivetrain provides smooth and reliable gear shifting

• Hydraulic disc brakes improve braking control in all weather conditions

• Wider tyre clearance enhances comfort on rough roads

• Internal cable routing keeps the cockpit clean and low maintenance

Why Choose This Product

• Race-Ready Design: Aero performance inspired by professional racing bikes

• Premium Carbon Frame: Lightweight and responsive for efficient riding

• Modern 12-Speed Drivetrain: Smooth shifting across varied terrain

• Enhanced Comfort: S-FLEX seat post improves ride quality

• Versatile Road Capability: Excellent for racing, training, and long-distance rides

• Outstanding Value: Advanced aero technology at an accessible price point

In the Box

• 2026 Merida REACTO 4000 bike

• Shimano 105 drivetrain installed

• User manual

• Reflectors and accessory kit