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2025 Merida

REACTO 4000

A carbon frame aero bike with upper mid-range components and shimano 105 hydraulic disc brakes.
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Manufacturer Price

2 400 £GB(2 768 €)
Weight9,0 kg  
FrameCarbon
ForkCarbon
Wheels700c Aluminum
Drivetrain2 × 12
Groupset105
BrakesShimano 105 Hydraulic Disc
View on merida-bikes.comLearn about Merida
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Insights
Ride Feel

Based on frame geometry and build specs.

Rider Position
relaxedaggressive
Terrain
smoothrugged
REACTO 4000
Other Aero bikes
Gearing

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Lowest gear

(climbing)

66 km/h

REACTO 4000

64 km/h

Similar Bikes

Highest gear

(descending)

Spec Level

Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.

Compare the full REACTO model range

View Comparison
Sizing
XS

156cm – 166cm

SM

163cm – 174cm

MD

171cm – 182cm

LG

179cm – 189cm

XL

185cm – 195cm

🐐 Estimated

Rider Fit Notes
  • 176cm, size S, Just right
  • 196cm, size XL, Just right
  • 85cm, size S, Just right
  • 175cm, size SM, Fits small
Reviews
Gran Fondo Magazine
MERIDA REACTO TEAM Review in our 2026 Aero Road Bike Comparison

mars 2026 · Calvin Zajac

Freshly launched and already lining up in our 2026 aero road bike comparison: the MERIDA REACTO TEAM. Is it ready to take the fight to the established competition?

Highs
  • Super-intuitive, direct handling

  • Distinctive, stylish design

  • High efficiency

  • Low weight

Lows
  • No UDH derailleur hanger

Read Review

Bikerumor
<200W Merida Reacto 5 Aero Road Bike is One of World's Fastest; Versatile & Affordable, Too!

mars 2026 · Cory Benson

The new Merida Reacto 5 is the fastest aero road bike yet in benchmark GST wind tunnel testing, but it's more versatile, too!

Read Review

Escape Collective
Merida’s new Reacto – More all-rounder than outright aero bike

mars 2026 · Alex Hunt

With a 14-watt gain and a geometry frozen in time, Merida’s fifth-generation Reacto chases balance alongside aero improvement.

Read Review

road.cc
Merida Reacto 9000

août 2025

Five years on, the Reacto is still a fast and planted aero road bike that is able to compete with the best in the category

Highs
  • Good specification

  • Sharp handling

  • Stiff bottom bracket

  • Stealthy appearance

  • Balanced geometry for an aero bike

Lows
  • No power meter

  • 30mm tyre clearance is dated

  • New model imminent

Read Review

Cyclist
Merida Reacto 4000 review

janv. 2022 · Matthew Loveridge

Merida's most affordable aero bike retains the pro machine's best qualities

Highs
  • Exciting

  • Racy ride

  • Comfortable

  • Super-clean design

Lows
  • Basic wheels

  • Non-tubeless tyres

Read Review

Geometry
Specs
Build
Frame

REACTO CF3 IV, material: carbon, 700x30C max. wheelsize, 100x12/ 142x12mm axle standard, BB86,5 bottom bracket standard

BB StandardBB86/BB92, 86.5mm, Press Fit

Tire Clearance30c

Fork

REACTO CF3 IV DISC, material: carbon, 700x30C max. wheelsize

Bottom Bracket

Shimano SM-BB72-41B, Pressfit 86.5

Headset

MERIDA TEAM SL, VP-MRBHB (OP203 neck)

Stem

MERIDA EXPERT SL 2PII, material: aluminium, 9° stem angle, 90 mm (3XS/XXS/XS), 100 mm (S), 110 mm (M/L), 120 mm (XL),

Handlebar

MERIDA EXPERT CW, material: aluminium, 380mm (3XS-XXS-XS-S), 400mm (M-L-XL)

Saddle

MERIDA EXPERT SL, 6% recycled and 23% nature material, V-mount, incl. MERIDA minitool

Seatpost

MERIDA TEAM CW, Aero shape, 15mm setback, Carbon

TypeRigid

Groupset
Rear Derailleur

Shimano 105, GS

Front Derailleur

Shimano 105

Crank

Shimano 105, 52-36 teeth, 165 mm-XXS, 170 mm-XS, 172.5 mm-S/M/L, 175 mm (XL),

Shifters

Shimano 105 disc

Cassette

Shimano 105 R7101, 11-34 teeth, 12 speed

Chain

Shimano M6100-12

Brakes

Shimano 105, Hydraulic disc

TypeShimano 105 Hydraulic Disc

Brake Levers

Shimano 105

Wheels
Rims

MERIDA EXPERT CW, 19mm inner width, 30mm height, material: aluminium, Tubeless ready (tubeless tape and valves not included)

Spokes

Double Butted Black stainless

Front Hub

Shimano HB-TC500 / Shimano HB-TC500-HL, 100x12mm width front hub, 28 spoke holes, Centerlock, 12-142mm width rear hub, 28 spoke holes, Centerlock

Rear Hub

Shimano HB-TC500 / Shimano HB-TC500-HL, 100x12mm width front hub, 28 spoke holes, Centerlock, 12-142mm width rear hub, 28 spoke holes, Centerlock

Tires

Front: Continental Ultra Sport III, 700x28C, fold, Rear: Continental Ultra Sport III, 700x28C, fold

Disc Rotors

Shimano RT54, 160mm

Rider Notes
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