[Bike Review] The 6-Year Wait Is Over! All-New MERIDA REACTO Gen 5 ๐ดโโ๏ธ Ranked #1 in TOUR Magazine's Wind Tunnel Test โ Full Review! | Jollymap
Posted by Jollymap - 2026-06-29T00:00:00.000+08:00
MERIDA REACTO Gen 5 In-Depth Review | Ranked #1 in Wind Tunnel Testing! The Aero King Has Finally Arrived After 6 Years | Jollymap
Introduction: Six Years in the Making โ A Game-Changer in the Aero Bike World
Hello fellow cyclists and neighbours! We're Jollymap, your local Hong Kong specialty shop for bikes and outdoor gear.
Today, we want to share with you a bike that took the Taipei Cycle Show by storm โ the brand-new MERIDA REACTO Gen 5!
When it comes to REACTO, most Hong Kong cyclists already know the name. It has long been one of the most popular bikes on local roads, with a loyal following over the years. And this latest iteration is genuinely exciting โ not just because of the six-year wait, but because the all-new frame design and striking looks are enough to get your heart racing at first glance!
But if you think it's all about looks, you're in for a surprise. In Germany's prestigious TOUR Magazine independent wind tunnel test, the new REACTO ranked #1 among production aero frames, beating top European names like the Cervรฉlo S5 and Colnago Y1Rs.
So what makes the REACTO Gen 5 so special? How did it earn that #1 spot in the wind tunnel? Let Jollymap break it down for you, piece by piece!
1. What Is REACTO? One of MERIDA's Two Flagship Models
For newer riders just getting into road cycling, let's start with a quick introduction.
REACTO is MERIDA's flagship aero road bike, designed for competition-level aerodynamics โ built for speed and minimal wind resistance.
MERIDA has two flagship road bikes:
| Model | Specialty |
|---|---|
| REACTO | Aerodynamics & speed |
| SCULTURA | Climbing & lightweight |
Each targets different riding needs, and REACTO shines on flat roads, sprints, and long-distance cruising.
2. A Six-Year Evolution: This Is No Spec-Sheet Special
Six years have passed since the previous REACTO. But don't think MERIDA was just sitting around โ they've poured serious effort into this project:
- Extensive design work
- Computer-simulated wind tunnel testing
- Initial design completed in 2024
- A full year of real-world racing with pro teams on the UCI circuit in 2025
- Continuous optimisation
- Official release in 2026
So this REACTO Gen 5 is absolutely not a bike built just to win on paper. MERIDA's goal was to create a bike that delivers an excellent balance of aerodynamics, handling, and comfort โ whether you're a pro racer or a weekend warrior.
The Five Original Design Goals
- Top-tier all-round performance
- Maintained comfort
- Reduced aerodynamic drag
- Lighter weight
- Tyre clearance up to 32mm
And it's exactly this combination of engineering effort that earned it a top ranking in TOUR Magazine's authoritative wind tunnel test!
3. The TOUR Wind Tunnel Test: Why #1 Among Production Bikes Really Matters
Just how prestigious is this test? Let's explain.
The Methodology
- A complete bike with a half-body mannequin placed in a large wind tunnel
- Simulated speed: 45 km/h
- Measured drag in watts (W)
The lower the wattage, the more efficient the airflow and the better the bike cuts through the wind.
REACTO Gen 5's Result
- Drag: only 197W
- One of the rare frames to dip below 200W
- #1 among all production aero frames
- Outperformed Cervรฉlo S5, Colnago Y1Rs, and more
This isn't marketing fluff โ it's scientifically tested, real-world performance.
4. The Front End: Mastering the First Line of Wind Resistance
The front of the bike is the first to encounter wind, so optimising it has a huge impact on overall aero performance.
- Wider, Flatter Fork: The new fork is wider and flatter than the previous generation, significantly reducing drag while redirecting airflow smoothly toward the rear.
- Flattened Head Tube: The head tube is also flatter, reducing frontal drag while maintaining a wide profile to guide air along the bike's streamlined shape and reduce turbulence behind the frame.
- Wider Gap Between Down Tube and Front Wheel: A clever piece of engineering! Through computer simulation, MERIDA discovered that maintaining a specific distance actually improves airflow management, channelling wind from the wheel toward the rear.
- All-New Vision Team CW Gull-Wing Integrated Carbon Cockpit: MERIDA partnered with Vision to design an entirely new gull-wing-shaped Team CW carbon cockpit, dramatically boosting aerodynamic performance.
5. The Mid & Rear Frame: A "Twin-Wing" Aero Design
Of course, aerodynamics isn't just about the front end. The middle and rear of the frame also feature obvious aero refinements.
- Relocated Battery & Slimmer Seat Tube: The battery has been moved from the seat tube to the bottom bracket area, which is why you'll notice an elegantly slim seat tube paired with a wider profile โ both contributing to better airflow.
- Inherited Dropped Seatstays โ The Twin-Wing Effect: Carrying over the dropped seatstay design from the previous generation, combined with the slim seat tube, creates a striking "twin-wing" visual effect. It's not just sleek-looking โ it also further enhances airflow management.
- The BB Area โ Streamlined & Wide: The bottom bracket area features streamlined contours and a wide stance, which: improves pedalling stiffness, channels airflow effectively, and even gives off a hint of TT (time trial) bike aesthetic.
6. Weight Management: Bigger Surface Area, Yet Lighter!
You might be wondering: "With a much larger frame surface than the last generation, won't it be heavier? Won't climbing be harder?"
Don't worry! Taking the CF5 frame as an example:
| Item | Data |
|---|---|
| Frame weight change | Decreased, not increased |
| Lighter than previous gen by | 108g |
| Medium-size bare frame | Just 950g |
That's competitive with dedicated climbing frames!
Complete Bike Weight: Pushing the UCI Limit
The top-spec REACTO Gen 5 build can reach a complete bike weight of just 7.1kg. With the UCI race weight limit set at 6.8kg, you're essentially riding what Tour de France pros race on!
For cyclists who want to climb and sprint, this level of weight control is truly elite.
7. Comfort Upgrades: Aero Bikes No Longer Have to Be Harsh
Traditionally, aero bikes have a reputation for being stiff and uncomfortable. But one of REACTO Gen 5's key design goals was comfort. Here's how it delivers:
- Further Dropped Seatstays: Reduce vibration from the rear wheel, providing natural shock absorption.
- S-Flex Seatpost: A signature design from the previous generation, this seatpost offers excellent vibration damping, making long rides far less fatiguing.
Tyre Clearance Up to 32mm
REACTO Gen 5 supports tyres up to 32mm wide! With 28โ30C now the standard in major races, going slightly wider offers several benefits:
- Lower tyre pressure
- Less bumpiness over rough roads
- Reduced vibration
- Better grip
- Improved rolling efficiency
Wider tyres aren't just about comfort โ they actually boost overall performance!
8. Frame Geometry: Seamless Transition for Returning Riders
Although REACTO is a race-ready bike, don't worry โ the geometry isn't aggressive to the point of being unrideable.
Good News for Previous REACTO Owners
The Gen 5 geometry is identical to the previous generation! Upgrading is completely seamless โ no need to readjust to a new frame fit.
M-Size Geometry Data
| Item | Value |
|---|---|
| Stack/Reach Ratio | 1.41 |
| Compared to other brands | Similar |
| Headtube spacer adjustment | About 25mm |
MERIDA Sizing: Widest Range on the Market
A quick note on sizing: MERIDA's size charts run slightly different from other brands. For example, their XS is roughly equivalent to a Giant Medium.
But MERIDA is one of the few brands offering such a broad size range:
- Sizes from 3XS to XXS for petite riders
- Teen and young adult riders can finally enjoy aero bikes
- No more compromising on an oversized frame
9. Jollymap Bike Fit Service: Choosing the Right Size Matters Most
Not sure which size to choose or how to set up your frame? Jollymap offers:
Size Fit Service
Quick recommendation to find the right size bike for you.
Full Bike Fit Service
We measure your:
- Height
- Arm length
- Body flexibility
- Riding habits
- Comfort needs
Then we recommend the right bike size and configure:
- Number of spacers
- Stem length
- Saddle height and fore-aft position
- Handlebar angle
Drop by our Jollymap store for a personal consultation!
๐ More about Bike Fit
๐ฌ WhatsApp Enquiry
10. Spec Highlight: REACTO 5000
Here we have the REACTO 5000, with the following spec:
| Component | Specification |
|---|---|
| Drivetrain | Shimano 105 Di2 electronic shifting |
| Saddle | Prologo upgraded saddle |
| Wheels | Vision 35mm depth |
| Tyres | 28C |
| Handlebar | Aluminium alloy |
| Complete bike weight (with computer mount) | 9.17kg |
Other Models Coming Soon
REACTO Gen 5 will arrive in Hong Kong with more variants, including:
- Team Series
- Frame-only pre-order option
- Team Edition gull-wing carbon cockpit (available separately for pre-order)
Stay tuned to the Jollymap website and Facebook for updates!
11. Who Should Buy the REACTO Gen 5?
โ Speed and sprint enthusiasts โ #1 aero performance among production bikes
โ Flat-road and long-distance cruisers โ Hong Kong's roads are mostly flat (e.g. Tsing Kwai, Sunny Bay, Disneyland area)
โ Riders seeking all-round performance โ balanced aero, climbing, and comfort
โ Existing REACTO owners โ identical geometry means a seamless upgrade
โ Petite riders โ 3XS to XXS sizing options
โ Aspiring racers โ UCI-compliant
โ Not ideal for: Pure mountain climbers chasing the lightest possible build (consider SCULTURA instead)
12. Real-World Testing in Hong Kong: Why It Suits Local Riders
Our host "Baldie" Jason is a REACTO owner himself, and as a longtime user, he believes this isn't just a minor facelift โ it's a massive leap forward!
Why is this bike so perfectly suited for Hong Kong?
1. Hong Kong Roads Are Mostly Flat
Most local cycling routes โ including:
- Tsing Kwai Highway (Tsing Ma Bridge route)
- Sunny Bay
- Disneyland route
- Tai Po waterfront
- Yuen Long / Kam Tin countryside
โ are predominantly flat. This is exactly where aero bikes shine!
2. Well-Managed Weight
Despite being an aero frame, the complete bike weight is impressively controlled, so even minor climbs won't tire you out.
3. Truly All-Round
Sprint on flats, cruise comfortably on long rides, handle the occasional climb โ one bike, many uses.
13. Conclusion: A New Benchmark in the Aero Bike World
Backed by six years of R&D and the credibility of a #1 wind tunnel ranking among production bikes, the MERIDA REACTO Gen 5 is undeniably one of the most important aero bike releases of 2026.
Three Key Takeaways
- Top-tier aerodynamics: 197W drag โ #1 among production bikes
- Excellent weight control: 950g medium frame, complete builds as light as 7.1kg
- Greatly improved comfort: S-Flex seatpost + 32mm tyre clearance + dropped seatstays
If you're looking for a do-it-all road bike that can take you from training to long rides to race day, the REACTO Gen 5 absolutely deserves a spot on your shortlist!
Contact Jollymap Today!
Got questions about the MERIDA REACTO Gen 5? Want to book a test ride, learn about our Bike Fit service, or arrange a pre-order? Get in touch:
๐ฌ Visit our Hong Kong store
๐ฌ WhatsApp / IG / FB Inbox
๐ Phone enquiry: 2342 0780
So, fellow riders โ what's your top priority? Speed, comfort, or weight?
Jollymap โ Hong Kong's trusted partner for cycling and the outdoors. ๐ดโโ๏ธ๐จ
๐ Shop Now: The MERIDA REACTO Family
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