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Merida Reacto Disc 4000 - 2021


Merida Reacto Disc 4000 - 2021

Frame Size

Our Reacto has always been a class-leading aero bike, combining state of the art aerodynamics and comfort. The 4th generation Reacto is more slippery and beautiful than ever, incorporating wider tyres and much neater cockpit cable integration. 

With its predecessor delivering almost unrivalled aerodynamic performance, we had to look at the smallest incremental improvements. Computational Fluid Dynamics (CFD) calculations modelled performance in a virtual wind tunnel to optimise aerodynamics guiding the changes which gave most aerodynamic benefit: New fork design, smoothly integrated into the frame, significant 2 Watt improvement New handlebar design completely integrating the cables, saves about 2 watts per cable Increased gap between the tyre and seat stays and between the tyre and fork crown and blades optimises airflow in those key areas. A lower junction between the seat stays and seat tube further reduces drag. Further small details such as integrating the front disc cooler behind the fork and the rear in the rear triangle and creating new through axles with the thread integrated into the fork dropout also minimise drag and improve aerodynamic performance. 

All these improvements enable us to over-compensate the aerodynamic compromises made to give the bike bigger tyres. The result: the perfect package of comfort, aerodynamic, lightweight and style. Prototypes were wind tunnel tested following the German TOUR magazine standard, including the ‘moving leg dummy’ test. The new Reacto needs just 209 watts effort for 45 km/h speed, 1 watt faster than its predecessor, and in the leading group of aero road bikes ever tested by TOUR magazine. The 4000 uses a CF3 frame, the same geometry and features, but with more economic fibres used in the carbon lay-up.
  • Frame: CF3 carbon frame with the same race-proven geometry as the CF5 with NACA fastback profiled tubes for efficient aerodynamics. Tapered headtube for confidence-inspiring handling, BB86, bolt-through axles, disc cooler
  • Fork: Reacto CF3 IV Disc; carbon
  • Rims: Merida Expert CW; 19mm inner rim width; 30mm profile
  • Spokes: Double Butted Black stainless
  • Front Hub: VP CLK170F; 100x12mm; 28 spokes, Centerlock
  • Rear Hub: VP 270SB; 12-142mm; 28 spokes; Centerlock; including removable lever with 4/6mm Allen key
  • Front Tyres: Continental Ultra Sport III; 700 x 25C; Kevlar bead; folding
  • Rear Tyres: Continental Ultra Sport III; 700 x 25C; Kevlar bead; folding
  • Speed: 22
  • Shifters: Shimano 105
  • Front Derailleur: Shimano 105
  • Rear Derailleur: Shimano 105 GS
  • Crankset: Shimano 105; 52-36 teeth chainwheel with 165mm - XSS, 170mm - XS/S, 172.5mm - M, 175mm - L/XL length crank
  • Cassette: Shimano CS-R7000; 11-30 teeth; 11 speed
  • Bottom Bracket: SM-BB71-41B, Pressfit 86.5
  • Chain: KMC X11
  • Brakes Levers: Shimano 105 R7000
  • Front Brakes: Shimano 105; Hydraulic disc with Shimano RT54; 160mm rotor
  • Rear Brakes: Shimano 105; Hydraulic disc with Shimano RT54; 160mm rotor
  • Tape: Merida Road Expert
  • Handlebar: Merida Expert CW
  • Stem: FSA NS SMR; aluminium - Length: 90 mm-XXS/XS, 100 mm-S, 110 mm-M, 120 mm-L/XL
  • Headset: FSA ACR
  • Saddle: Merida Expert CC with saddlebox containing Merida Multitool
  • Seat Post: Merida Team CW; Aero shape; 15mm lay back; Carbon with integrated light and battery

Specific References