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Merida Reacto 4000 Road Bike Glossy Red/Matt Black (2021)

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Merida Reacto 4000

  • Brand new Merida CF3 Carbon Frame & Fork
  • 2x11 Speed Shimano 105 Drivetrain
  • Shimano 105 Hydraulic Disc Brakes
  • Merida Expert SL Wheels


"For this fourth version of the Reacto, Merida has looked to tip the balance away from pure aerodynamics to create a bike that has all of the DNA of a pure-bred aero machine, but is an 'all-rounder with class-leading aerodynamic performance'. The best of both worlds, then?"
-Senior Editor Warren Rossiter

Bike Radar

The Merida Reacto 4000 Aero Road Bike brings the all new V4 Reacto Frame for the most advanced aero riding experience. The Reacto is a high-performance aero road bike with stable ride characteristics which allows you to ride in relative comfort for such a performance focused bike. The CF3 Carbon frame lays the platform for this efficient road machine, offering similar stiffness and stability as the top of the line CF5 frame, just ever so slightly heavier.

It also comes with a brand new fork design which is intelligently integrated into the frame, while the new handlebar design and removing all the cables (by completely integrating the cables into the cockpit and frame) not only looks super smooth but each integrated cable saves up to 2 watts. The Reacto 4000 is kitted out with a 2x11 speed Shimano 105 Groupset with an 11-30t cassette for swift road riding.

Also new in 2021 is the front and rear integrated disc coolers to prevent overheating so that you can get the most out of the Shimano 105 Hydraulic Disc Brakes. It may come standard with a Merida Expert CW Wheelset and Continental Ultra Sport III 700x25c tyres but one of the big changes is that the new Reacto now has tyre clearance for 30mm tyres which really adds to the comfort, smoothness and stability without a significant impact on performance. As the entry point to the high end Reacto range the main differences between this model and the next model up, the Reacto 6000 is the groupset (Ultegra vs 105) as well what you’re rolling on, Fulcrum Racing 800DB wheels with Continental Sport Race Tyres on the 6000 instead of a Merida Expert Wheelset with Continental Grand Sport Ultra III Tyres.

The Merida Reacto 4000 is one of the most comfortable aero road bikes on the market so that you can take it from training to race day in a flash. The brand new frame improves both efficiency and comfort and is an aerodynamic jack of all trades on the road.

Cable Integration

One of the key elements of the new REACTO that further improves the already impressive aerodynamic performance is the complete cable integration, hiding all cables from view and wind exposure and generating a 2 Watts saving.

Tyre Clearance

The new fork and frame allow tyres of up to 30 mm to be fitted, which besides the well- proven S-Flex seat post, further improve the comfort as well as the road grip of the new REACTO so that you can ride in comfort on rough surfaces.

Disc Cooler

The 2nd gen disc coolers are further integrated into the frame and fork to minimise drag and reduce the risk of the disc brakes overheating on long descents. The forged aluminium part under the front and rear disc brake caliper draws heat away through CNC-milled cooling fins for 35% less heat build-up and faster temperature reduction.

More Information
SKU 21MeridaReacto4000GlossyRedMattBlack
Season 2021
Wheel Size 700c
Frame Material Carbon
Fork Material Carbon
Groupset Brand Shimano
Groupset Shimano 105
Cassette Type 11 Speed
Chainset Type Double
Brake Type Hydraulic Disc Brake
Bottom Bracket SM-BB71-41B, Pressfit 86.5
Brakes Shimano 105; Hydraulic disc
Brake Levers Shimano 105 R7000
Cassette Shimano CS-R7000; 11-30 ATC; 11 Speed
Chain KMC X11
Crankset Shimano 105; 52-36 ATC
Derailleur Front Shimano 105
Derailleur Rear Shimano 105; GS
Frame REACTO CF3 IV; MAT carbon; 700C WHS; 100x12/ 142x12 AST; BB86,5 BBR
Grips MERIDA ROAD Expert
Handlebar MERIDA Expert CW
Headset FSA ACR
Hubs VP 270SB; 12-142 WHR; 28 Spokes; Centerlock
Pedals not included
Rims MERIDA Expert CW; 19 IWR; 30 HRI
Saddle MERIDA EXPERT CC + MERIDA Multitool with Saddlebox
Seatpost MERIDA Team CW; Aero shape; 15 Setback; Carbon
Stem FSA NS SMR; MAT aluminium
Spokes Double Butted Black stainless
Shifters Shimano 105 disc
Tyres Continental Ultra Sport III; 700x25C; fold
Speeds 2 x 11
Sizing SKUs XS:MERA2185779, SM:MERA2185780, MD:MERA2185791, LG:MERA2185809, XL:MERA2185810

Road Bike Geometry Diagram


ST Seat Tube

TT Top Tube

CS Chain Stay Length

HTA Head Tube Angle

STA Seat Tube Angle

BD Bottom bracket Drop

HT Head Tube

FL Fork Length

R Reach

S Stack

WB Wheel Base


Wheel Size 700c 700c 700c 700c 700c
Frame Size 50 52 54 56 59
ST Seat Tube (mm) 500.0 520.0 540.0 560.0 590.0
TT Top Tube (mm) 536.0 545.0 560.0 575.0 590.0
CS Chain Stay Length (mm) 408.0 408.0 408.0 408.0 408.0
HTA Head Tube Angle (°) 72.0 72.5 73.5 73.5 74.0
STA Seat Tube Angle (°) 74.0 74.0 73.5 73.0 73.0
HT Head Tube (mm) 112.0 128.0 140.0 155.0 176.0
R Reach (mm) 384.0 390.0 395.0 400.0 409.0
S Stack (mm) 529.0 542.0 557.0 571.0 593.0
WB Wheel Base (mm) 983.0 990.0 990.0 999.0 1010.0


About Merida

In September 1972, Ike Tseng (1932–2012) a brilliant engineer and visionary founded MERIDA. While visiting the USA, Ike saw a sign in a bike shop that stated refusal to repair any Taiwanese bikes, due to the unfavourable quality. As a result of this he set out to fulfil his dream of high quality bikes made in Taiwan and formed the MERIDA Industry Company Ltd.

The MERIDA name has three syllables Me-Ri-Da and it is the company’s intention to manufacture beautiful, high quality bikes that enables everyone to reach their destination enjoyably. MERIDA created a world-leading bike factory but Ike still wasn’t satisfied, so in 1988 the MERIDA brand was launched. Ike’s vision is still very much a part of MERIDA, manufacturing all kinds of bikes from children’s bikes to world-class professional road and mountain bikes for the Bahrain- MERIDA team riders. Everybody has a different journey, and everyone can benefit from a MERIDA.

View Merida Range

Merida Reacto Sizing Chart

Rider's Height (cm)

This is an accurate estimate, and every new bike comes with a free professional bike fit when you click & collect in store, plus all bikes have a 30 day Perfect Ride Guarantee.

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