Merida Merida Reacto 4000 Carbon Aero Road Bike Grey/Silver Large 56cm *Custom Edition with Reynolds Wheels and Ultegra Di2*

Information

The Merida Reacto has long set the benchmark for aero road bikes, blending cutting-edge aerodynamics with impressive rider comfort. Now in its fourth generation, the Reacto is faster, sleeker and more refined than ever. Wider tyres, cleaner cockpit cable integration and a series of carefully considered updates deliver meaningful performance gains without compromising ride quality.

At the highest level of Pro-Tour racing, every detail matters. Extensive Computational Fluid Dynamics (CFD) analysis was used to simulate performance in a virtual wind tunnel, allowing Merida’s engineers to focus on the changes that delivered the greatest aerodynamic benefits. These developments were then validated through wind tunnel testing to the strict German TOUR magazine protocol, including the demanding moving-leg dummy test.

The flagship Reacto CF5 requires just 209 watts to maintain 45 km/h — one watt faster than its predecessor — placing it among the most aerodynamic road bikes ever tested by TOUR magazine. Aerodynamic efficiency is further enhanced by details such as the integrated front disc cooler behind the fork, the rear brake calliper neatly housed within the rear triangle, and newly designed bolt-through axles with integrated threads to reduce drag.

Despite accommodating larger tyres for improved comfort and control, the Reacto more than offsets any aerodynamic compromises through a multitude of small refinements. The result is a perfectly balanced package of speed, comfort, low weight and striking design. Its performance credentials are backed up by numerous test wins and industry awards. Cycling Weekly called it “without doubt one of the most complete bikes available on the market”, Cyclingnews described it as “an utterly brilliant and faultless machine”, while Cycling Plus were “hugely impressed”.

All Reacto models are equipped with powerful hydraulic disc brakes. The flat-mount calipers are positioned on the chainstay for improved braking force distribution and a clean appearance, sitting atop CNC-machined aluminium Disc Cooler fins that reduce operating temperatures by up to 35%.

Specifications

Frame: Reacto CF3 IV carbon frame, sharing the same geometry and aerodynamic profiling as the CF5 IV, with a more cost-effective carbon lay-up. Tapered head tube, Disc Cooler technology, BB86 bottom bracket standard, 142 × 12 mm thru-axle. Maximum tyre clearance: 700 × 30c.
Fork: Reacto CF3 IV Disc; full carbon with tapered steerer and Disc Cooler technology. Maximum tyre size: 700 × 30c.
Headset: FSA ACR, 3 mm thinner neck.

Stem: MERIDA EXPERT SL 2P II; aluminium; -9° angle. Lengths: 90 mm (XXS/XS), 100 mm (S), 110 mm (M/L), 120 mm (XL).
Handlebar: MERIDA EXPERT CW; aluminium. Widths: 380 mm (XXS–S), 400 mm (M–L), 420 mm (XL).
Grips: MERIDA Road Expert.

Brake Type: Hydraulic disc brakes.
Front Brake: Shimano Ultegra hydraulic disc brake with Shimano CL800 160 mm rotor.
Rear Brake: Shimano Ultegra hydraulic disc brake with Shimano CL800 160 mm rotor.

Tyres: Continental Grand Prix 5000S TR; 700 × 28c; tubeless-ready, Kevlar bead.
Wheel Size: 700c.
Rims: Reynolds AR 60 DB carbon wheels; 21 mm internal width, 60 mm rim depth.
Front Hub: Reynolds AR 60 DB; 100 × 12 mm, Centerlock.
Rear Hub: Reynolds AR 60 DB; 142 × 12 mm, Centerlock.

Gears: 24-speed.
Front Derailleur: Shimano Ultegra Di2 FD-R8150.
Rear Derailleur: Shimano Ultegra Di2 RD-R8150.
Shift Levers: Shimano Ultegra Di2.
Chain: Shimano CN-M6100-12.
Cassette: Shimano CS-R8101; 11–30T; 12-speed.
Chainset: Shimano Ultegra 52-36T. Crank lengths: 165 mm (XXS), 170 mm (XS), 172.5 mm (S/M/L), 175 mm (XL).
Bottom Bracket: Shimano SM-BB72-41B, PressFit 86.5.

Saddle: Prologo Scratch M5 with V-mount adapter; includes Merida mini tool.
Seatpost: MERIDA Team CW; carbon aero seatpost with 15 mm layback.