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Updated: Merida launches all-new Reacto aero road bike

Top-level race bike now available with discs as well as rim brakes

Merida has officially revealed the new version of its Reacto aero road bike, now available in both disc brake and rim brake models, each in two different geometries.

We've previously shown you sneak peeks of the new rim brake version of the bike that's raced at the top level by the Bahrain-Merida team.

Take a look at the road bikes that'll be raced in this year's Tour de France.

Merida Reacto 2017 down tube 2.jpg

The Reacto, first introduced by Merida in 2011 and developed into a pure aero road bike in 2013, has had a major redesign for for 2018. 

“It was time to go back to the drawing board to create the Reacto III – the lightest, fastest and most aerodynamic road bike in Merida’s history,” says Merida.

We quite often joke that every manufacturer says that its new road bike is lighter, stiffer, more aero and more comfortable than the previous version. Merida ticks a lot of those boxes here in claiming a lighter weight, improved aerodynamics and extra comfort, but it doesn’t claim extra stiffness… although the stiffness of the previous version has apparently been maintained. 

Merida Reacto 2017 down tube cable entry.jpg

Merida says that it has also focused on simplicity in order to keep workshop bills to a minimum. 

Plus, disc brake options have been added to the Reacto roster for the first time with Merida claiming the difference in aero efficiency between the rim brake and disc models being less than one watt at 45km/h.


Merida – a Taiwanese brand although much of its engineering is handled in Germany – says that the new Reacto is more aerodynamically efficient than the previous version by about eight watts at 45km/h. That equates to around 5%.

“This was achieved by slimming down the tube shapes, introducing a lower seatstay connection and adding a one piece cockpit with integrational features,” says Merida.

Merida Reacto 2017 seatstays.jpg

The seatstays have been modified to have a larger bend towards the cassette for an improved aerodynamic performance.

The head tube and top tube section have been designed to work with the FSA Metron 5D Cockpit. The idea is that this reduces drag without sacrificing the serviceability of the handlebar/stem and cable routing.

Merida Reacto 2017 seatpost clamp.jpg

“If you do a solo ride with the new Reacto over 100km (62.5 miles), you save as much energy as riding the same distance with a traditional round-tubed road bike but drafting 30km of the whole distance.”

That’s an interesting way of expressing it.


Merida says that it has improved comfort by redesigning the seatstays and giving its S-Flex seatpost a slimmer cross section and a bigger ‘window’ – the notch that’s cutaway to add more downward movement (the material in the notch doesn't affect the level of compliance, by the way, it just fills the void; it's the fact that the notch exists that's the important thing).

Merida Reacto 2017 seatpost.jpg

The improvement here is around 10%, according to Merida. You’ve got to love a comfort stat!


Merida says that the weight of the Reacto (rim brake) frame, fork, seatpost, seatpost clamp and headset has come down from 2,046g to 1,695.5g. That’s over 350g. 

Fans of percentages will be pleased to know that that’s a reduction of 17.13% – huge, especially considering that that previous Reacto was a World Tour level bike.

The frame is now a claimed 1,010g (CF4 version – explanation below – rim brakes) while the fork is 368g. 

How has Merida managed to save the weight? It’s simply down to slimming the tube diameters and using different carbon-fibre layups.


Merida Reacto 2017 frame label.jpg

As mentioned, Merida says that the Reacto’s level of stiffness is unaltered despite the lower weight (so the stiffness to weight ratio increases. Obviously!).

Merida Reacto 2017 frame at bottom bracket.jpg


As well as being available in both rim brake and disc brake models, the new Reacto (like the existing Scultura) will come in both CF2 and CF4 versions (the CF stands for carbon-fibre). 

The CF4 versions are lighter and come in a more aggressive geometry. They also have integrated cockpits. The CF2 models still have a race geometry, just not as full-on as that of the CF4.

To take a large sized frame as an example: the head tube of the CF2 is 197mm compared with 172mm for the CF4. The top tube and seat tube lengths are exactly the same. The stack is 22mm higher and the reach is 6mm shorter on the CF2 so there’s a definite difference but it’s not huge – it’s not like the CF2 model has some sort of sportive/endurance geometry.

Headset spacers

Merida Reacto 2017 Vision bar.jpg

The CF4 version of the Reacto comes with special spacers that integrate with FSA’s Metron 5D handlebar. 

Merida Reacto 2017 head tube headset.jpg

The CF2 Reacto has aero shaped spacers that work with regular stems (you can have a standard handlebar/stem set-up on the CF4 if you like).

Both versions take a 1 1/8in upper bearing. The CF2 takes a 1 1/2in lower bearing while the CF4 has a 1 1/4in lower bearing – its head tube is narrower for improved aerodynamics.


The rim brake versions of the Reacto take direct mount (rather than dual pivot) brakes while the disc brake models use the flat mount standard, just like pretty much every other disc brake road bike these days (160mm rotors front and rear).

Merida Reacto Disc 2017  - 10.jpg

The disc brake models come with cooler technology, a lot like Merida uses on its Sculturas. Essentially, there’s a forged aluminium component between the brake and the frame/fork that’s designed to allow heat to dissipate through CNC-milled cooling fins and reduce the amount of heat that gets transferred to the carbon-fibre on long descents.

Merida Reacto Disc 2017  - 9.jpg

The CF4 version of the disc brake frame uses the RAT (Rapid Axle Technology) first introduced by Focus for quick wheel changes in race situations, while the CF2 version has threaded 12mm thru axles.

Other stuff

The new Merida Reactos will be available in many different builds starting at Shimano 105 groupset level and going up to Shimano Dura-Ace Di2 and Sram Red eTap. We are yet to get information on prices and availability but we’re working on both.

I'll be riding the new Merida Reacto tomorrow and will be back with first impressions as soon as I can.

Mat has been in cycling media since 1996, on titles including BikeRadar, Total Bike, Total Mountain Bike, What Mountain Bike and Mountain Biking UK, and he has been editor of 220 Triathlon and Cycling Plus. Mat has been technical editor for over a decade, testing bikes, fettling the latest kit, and trying out the most up-to-the-minute clothing. We send him off around the world to get all the news from launches and shows too. He has won his category in Ironman UK 70.3 and finished on the podium in both marathons he has run. Mat is a Cambridge graduate who did a post-grad in magazine journalism, and he is a winner of the Cycling Media Award for Specialist Online Writer. Now over 50, he's riding road and gravel bikes most days for fun and fitness rather than training for competitions.

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