Merida Reacto 4000 IV2 Shimano 105 2024

Equipped with the lightweight CF3 carbon frame with race-proven geometry, the REACTO 4000 is far from being an entry-level bike, but if you are starting out with road racing or want a fast, well-balanced aerodynamic road bike, then it is the perfect choice.

The REACTO 4000 offers impressive comfort with its large tire clearance (up to 30 mm) and S-FLEX carbon seatpost. At the same time, the latest extremely smooth 12-speed Shimano 105 mechanical groupset keeps shifting under braking and perfect control. This is the ideal aerodynamic bike for your first steps in racing and for challenging club rides.

Absolute aerodynamic speed. The latest version of the REACTO has taken the cycling press by storm. A long string of test wins, perfect scores and awards confirm the successful symbiosis of the race-proven DNA of the previous model with the latest trends and technologies. Cycling Weekly called it "undoubtedly one of the most complete bikes available on the market," Cyclingnews "an absolutely brilliant and flawless machine," and Cycling Plus was "hugely impressed." From the serious cyclist to the enthusiast to the ambitious road cyclist, the REACTO is a great bike for many people. Its outstanding aerodynamic performance, light weight, easy handling and super-fast acceleration make it the perfect bike for criterium riders and sprinters. At the same time, its class-leading comfort gives it the ability to use its aerodynamic advantage even on the cobblestones or idyllic but pothole-filled alleyways littered with your favorite training ride.

Features

Lightweight CF3 carbon aero frame (approx. 1,150 g - in size M).
Shimano 105 12-speed mechanical groupset.
FSA ACR SMR stem/MERIDA EXPERT CW handlebar combination.
MERIDA S-FLEX carbon aero post.
DISC COOLER technology and WIRE PORT cable integration.
Seat post integrated rear light.

Technical Specifications

Frame

REACTO CF3 IV
Material: carbon
700x30C max. wheelsize
100x12/ 142x12 mm standard axle
Bottom bracket: Shimano SM-BB71-41B, Pressfit 86.5 mm
Pivots: MERIDA EXPERT SL, including removable lever, 6/4 mm allen key

Fork

REACTO CF3 IV disc
Material: carbon
700x30C max. wheelsize

Brakes

Shimano 105, Hydraulic disc
Discs: Shimano RT54, 160 mm

Cockpit

Headset: FSA ACR
Handlebars: MERIDA EXPERT CW, (aluminum), 380 mm (XXS), 400 mm (XS), 420 mm (S/M/L), 440 (XL)
Handlebar stem: FSA SMR ACR, (aluminum), -6° stem angle, 90 mm-XXS/XS, 100 mm-S, 110 mm-M, 120 mm-L/XL
Handlebar Tape: MERIDA ROAD Expert
Seatpost: MERIDA TEAM CW, Aero shape, 15 mm setback, Carbon
Seatpost clamp: MERIDA REACTO Aero
Saddle: MERIDA EXPERT SL, V-mount, incl. MERIDA minitool

Transmission

Front derailleur: Shimano 105
Shifter: Shimano 105 GS
Shifters: Shimano 105 disc
Crankset: Shimano 105, 52-36 teeth, 165 mm-XXS, 170 mm-XS, 172.5 mm-S/M, 175 mm-L/XL
Chain: Shimano CN-M6100-12
Sprocket pack: Shimano CS-R7100, 11-34 teeth, 12 speed

Wheels

Rims: MERIDA EXPERT CW
19 mm inner width
30 mm height
Material: aluminum
Tubeless ready (tubeless tape and velvole not included)
Hubs: VP CLK170F / VP 270SB
Front hub: 100x12 mm, 28 spoke holes, Centerlock
Rear hub: 142x12 mm, 28 spoke holes, Centerlock
Spokes: Double Butted Black stainless
Tires: Maxxis Highroad, 700x25C, fold/tubeless ready

Specifications are subject to change without notice.

Technologies

X-Taper Headtube
Steering precision is vital to safe and confident handling, and the X-TAPER HEADTUBE allows to significantly boost this precision. A larger headset diameter at the bottom paired with a smaller one at the top helps to deal with the strains modern riding and equipment can put on the headtube, all without adding unnecessary weight. It allows tapered forks to be fitted with ease and delivers precise and confidence-inspiring steering.

Internal Cable Routing
On the majority of our frames, we run the gear and brake cables and hoses through the frame. The cables enter and exit the frame through smooth sockets, or we use one of our other systems like SMART ENTRY or WIRE PORT to be routed through. Running the cables inside the frame protects them from the elements, gives a clean and neat look and can offer aerodynamic advantages.

Nano Matrix Carbon
NANO MATRIX CARBON is a special kind of carbon fibre where we add extremely tiny, nano-scale particles to the resin that binds the individual carbon fibres together. These then work on a molecular level to protect them from damage. It’s so effective that it can actually increase the finished carbon fibre’s impact resistance by up to 40%, allowing us to build stronger and lighter composite frames that result in a faster and tougher bike.

AWS Anti Wrinkle System
This is a method we use to manufacture our carbon fibre frames. First, the carbon fibre that makes up the frame is laid around special formers. We then use a bladder to compress the layers against the outside of the frame mould, giving a smooth and wrinkle-free internal finish, removing any voids in between the layers of carbon that can cause potential weak points, resulting in a stronger, lighter frame.

NACA fastback profile
This is a special kind of tube shape that helps reduce aerodynamic drag while also helping to reduce weight. It’s based around a teardrop profile that was originally developed in the aeronautical industry, but the rearmost portion of the profile is cut short. This reduces the amount of material needed to make the tube, but air still flows around it just as well, giving all the aerodynamic benefits but at a lower weight.

Disc Cooler
Used on our carbon fibre road and gravel bikes, DISC COOLER is a finned piece of forged aluminium that sits between the brake calliper and frame. The aluminium piece helps to draw heat from the braking system and radiates it away quickly. It reduces the temperatures by up to 35% and helps to keep your brakes working at their best for improved control and performance on long descents and under heavy braking.

Internal Clamp
When every second counts, the smallest of details can make the difference between winning and losing, so we look at every aspect of our frames to make them as sleek as possible. By using a seat post clamping mechanism that secures the post with a wedge inside the frame itself, we minimise the turbulence and potential drag while keeping post height adjustment simple, giving a frame that is more aerodynamic and also better looking.

Wire Port
MERIDA designed headsets that enable all control cables from the handlebar to enter the frame through the headset cover, creating a clean and uncluttered look, allowing for a lighter, stronger and more aerodynamic frame structure than with conventional cable ports. Depending on the model, the cables are run completely internally (including the bar and stem) or semi-integrated, where the cables enter the frame underneath the stem.