Merida Reacto 4000 Carbon Road Bike in Black/Gunal Grey

The latest generation of the Merida Reacto 4000 brings real changes where they count: better aerodynamics, lower weight, and tyre clearance up to 32 mm.

If you've been looking at a carbon aero road bike that can handle both race day and rough British lanes, this is one worth a proper look.

Same aero frame as the top-tier models

The Reacto 4000 uses the exact same super-aero frame shape found on Merida's flagship bikes. That means you're getting race-level aerodynamics without paying flagship prices.

The lightweight CF3 carbon frame (roughly 1,150 g in a size M) keeps things stiff where it matters and compliant where you need it, making it a genuinely fast road bike on flat roads and rolling terrain alike.

Paired with the Shimano 105 12-speed mechanical groupset and hydraulic disc brakes, this Shimano 105 carbon road bike is race ready straight out of the box. And because the 105 groupset is so well-proven, it's a solid platform to upgrade bit by bit as your riding progresses.

Who is it for?

The Merida Reacto 4000 road bike suits riders stepping into road racing for the first time, as well as experienced club riders who want an aerodynamic road bike without spending pro-team money. It's a brilliant aero race bike for UK crit circuits, where sharp handling and quick acceleration make a measurable difference. Sprinters and criterium racers will feel right at home.

That said, it's comfortable enough for long weekend rides too. The generous tyre clearance and the S-FLEX carbon aero seat post take the sting out of rough surfaces, so you can ride potholed country lanes or even the odd stretch of cobbles without feeling beaten up afterwards. A race-ready road bike that still treats you well on a five-hour training spin is hard to find at this price point.

Comfort and control in UK conditions

Shifting through the 12-speed Shimano 105 is smooth and precise, and the hydraulic discs give you confident braking in wet weather, something every UK rider thinks about.

The MERIDA EXPERT SL stem and EXPERT CW handlebar combination keep your position solid and controlled, and the DISC COOLER technology helps manage brake heat on longer descents. Cable routing is clean thanks to the WIRE PORT integration, and there's even a seat post-integrated rear light for visibility on darker rides.

This dark Merida comes in a Black/Gunmetal Grey finish that looks sharp without being flashy, a colour choice that hides road grime well between washes (a small thing, but anyone who rides UK roads in winter will appreciate it).

Spec at a glance

• Lightweight CF3 carbon aero frame (approx. 1,150 g, size M)
• Shimano 105 12-speed mechanical groupset with hydraulic disc brakes
• MERIDA EXPERT SL stem / MERIDA EXPERT CW handlebar
• MERIDA S-FLEX carbon aero seat post
• DISC COOLER technology and WIRE PORT cable integration
• Seat post integrated rear light
• Tyre clearance up to 32 mm

If you're after a lightweight carbon road bike that performs on race day and still rides well through the week, the Reacto 4000 is a strong option. With this black Merida bike now available in the UK, it's well worth considering before your next season starts.