Merida Reacto 4000 Road Bike Glossy Red/Matt Black
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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
Review
"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
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.
SKU | 21MeridaReacto4000GlossyRedMattBlack |
---|---|
Season | 2021 |
Sizing SKUs | XS: MERA2185779, SM: MERA2185780, MD: MERA2185791, LG: MERA2185809, XL: MERA2185810 |
Click & Collect | Yes |
Frame | REACTO CF3 IV; MAT carbon; 700C WHS; 100x12/ 142x12 AST; BB86,5 BBR |
Frame Material | Carbon |
Fork | REACTO CF5 IV DISC; MAT carbon |
Fork Material | Carbon |
Speeds | 2 x 11 |
Front Gears | Double |
Groupset Brand | Shimano |
Groupset | Shimano 105 |
Rear Gears | 11 Speed |
Crankset | Shimano 105; 52-36 ATC |
Pedals | not included |
Chain | KMC X11 |
Brake Type | Hydraulic Disc Brake |
Brakes | Shimano 105; Hydraulic disc |
Shifters | Shimano 105 disc |
Brake Levers | Shimano 105 R7000 |
Derailleur Front | Shimano 105 |
Derailleur Rear | Shimano 105; GS |
Cassette | Shimano CS-R7000; 11-30 ATC; 11 Speed |
Wheel Size | 700c |
Tyres | Continental Ultra Sport III; 700x25C; fold |
Rims | MERIDA Expert CW; 19 IWR; 30 HRI |
Hubs | VP 270SB; 12-142 WHR; 28 Spokes; Centerlock |
Spokes | Double Butted Black stainless |
Bottom Bracket | SM-BB71-41B, Pressfit 86.5 |
Handlebar | MERIDA Expert CW |
Headset | FSA ACR |
Grips | MERIDA ROAD Expert |
Stem | FSA NS SMR; MAT aluminium |
Saddle | MERIDA EXPERT CC + MERIDA Multitool with Saddlebox |
Seatpost | MERIDA Team CW; Aero shape; 15 Setback; Carbon |
Merida Reacto Sizing Chart
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.

Legend
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
Size |
XS | SM | MD | LG | XL | 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 |