Merida Reacto 4000 2026

£1,750.00  £2,400.00

Finance available with Novuna Personal Finance

Limited Stock Available
XXS
XS
S
M
L
XL

Part Number:

A62611A00161

GTIN:

4711256518404

Merida Reacto 4000 Carbon Aero Road Bike | Shimano 105 12-Speed

The Merida Reacto 4000 is more than just a race bike; it is a precision-engineered speed machine designed for riders who want the aerodynamic advantages of a pro-level frame combined with the reliability of a Shimano 105 groupset.

Whether you are sprinting for town signs, competing in local crits, or smashing your personal bests on training rides, the Reacto 4000 is built to turn every watt of energy into forward motion.

Key Features & Performance Benefits

  • CF3 Carbon Aero Frame: Featuring the same geometry as the top-tier CF5 models used by WorldTour pros, the CF3 carbon frame offers incredible stiffness for power transfer while keeping the weight impressively low.
  • Shimano 105 12-Speed Drivetrain: The industry standard for performance. Enjoy crisp, reliable shifting across a wide range of gears, perfect for conquering steep kickers and powering down long descents.
  • S-Flex Seatpost Technology: Aero bikes are notoriously stiff, but Merida’s patented S-Flex seatpost absorbs road vibrations, allowing you to stay fresher for longer in the saddle.
  • Integrated Cable Routing: Not only does the "Wire Port" system look incredibly clean, but it also reduces drag by tucking all cables away into the frame and fork.
  • Disc Brake Precision: Equipped with hydraulic disc brakes for consistent, powerful stopping performance in all weather conditions—essential for high-speed descending.

Why Choose the Merida Reacto 4000?

The Reacto has been a consistent "test winner" in cycling media for years. While many aero bikes feel harsh, the Reacto 4000 is praised for its compliance. It’s a bike that lets you ride fast all day, not just for a 20-minute sprint. With clearance for up to 30mm tires, you can further customize your ride for maximum grip and comfort.

Rider Profile: Ideal for competitive road racers, triathlon enthusiasts, and performance-oriented club riders looking for a "superbike" feel at an accessible price point.

Professionally Built Before Dispatch

Every bike purchased from On It Sports is built in-store by our experienced team and undergoes a full pre-delivery inspection (PDI) before being carefully prepared for shipping.

We take pride in ensuring each bike leaves our workshop properly assembled, checked, and ready for final setup, helping you enjoy a smooth and confident first ride.

Some final assembly will be required on delivery, but we aim to keep this to a minimum wherever possible.


Free UK Mainland Bike Delivery

  • Free UK mainland delivery on bikes over £1000*
  • Bikes are professionally built, checked, and securely boxed before dispatch
  • Shipped using trusted UK courier services

*Bikes purchased through Cycle to Work schemes are excluded from free shipping.

A standard bike delivery charge of £45 applies.


Collect In Store & Free Basic Bike Fit

If you choose to collect your bike from our store, you’ll receive a free basic bike fit as part of your collection.

This includes:

  • Correct saddle height and position
  • Basic reach and comfort checks
  • Confidence that your bike is set up correctly from day one

Once your bike is ready, we’ll contact you by email to arrange a convenient collection and bike fit appointment.


Returns, Refunds & Exchanges

If you’re not completely satisfied with your purchase, please let us know. We offer a 30-day return or exchange period on items purchased with a valid receipt.

To be eligible for a return or exchange:

  • Items must be unused and in a resaleable condition
  • Original packaging, accessories, labels, and any free or promotional items must be included

Returns requested after 30 days cannot be accepted.

Save with Cycle to Work

We accept Cycle to Work vouchers on most full-price bikes through a wide range of approved schemes. Simply choose your bike, proceed through checkout, and select your Cycle to Work scheme at the payment stage.

Our checkout will guide you through the process, including any additional information required by your chosen scheme.


What You Can Include

Your Cycle to Work voucher can be used on:

  • Bikes
  • Helmets
  • Shoes
  • Clothing
  • Essential cycling accessories

This allows you to maximise your voucher and get everything you need in one purchase.


Using Cycle to Work at Checkout

When you reach payment:

  1. Select Cycle to Work as your payment option
  2. Choose your scheme from the dropdown list
  3. Enter the required voucher or scheme details
  4. Complete checkout

Our team will then process your order and contact you if anything further is required.


Important Information on Sale Bikes

* Sale bikes purchased using a Cycle to Work voucher may be subject to a surcharge.

This reflects the commission charged by Cycle to Work scheme providers.

If you’re considering using a Cycle to Work voucher on a discounted bike and want to confirm pricing before ordering, please contact us and we’ll be happy to help.

Why Shop With ONIT Sports?

At ONIT Sports, we aren't just a retailer; we’re a hub for the South Wales cycling and triathlon community. As a leading independent cycle specialist in South Wales, we know that the right bike isn't just about the specs - it’s about how it feels on the road, the trail, or in a TT. Whether you’re visiting us in-store or browsing online, you’re getting advice from people who live and breathe life on two wheels.

Expert Build & Safety Check

Every bike that leaves our hands is professionally assembled and safety-checked by our fully trained technicians. We don’t just "box" bikes; we prepare them so that they arrive at your door, set-up and ready for the first mile.

Premium Delivery & Setup

We offer fast, secure UK shipping on all bikes. For that extra touch of care, we also provide a FREE bike fit on bikes collected in store - ensuring your new pride and joy is setup for you, ready for your first ride.

Flexible Finance with Novuna & PayPal

We believe top-tier performance should be accessible. We offer a range of flexible finance solutions through Novuna Personal Finance, as well as PayPal options, allowing you to spread the cost with a plan that suits your budget

Cycle to Work Specialists

Looking to save on your next ride? We proudly accept a wide range of Cycle Scheme vouchers, helping you make the most of tax-free cycling benefits with zero hassle.

Start your cycling journey with On It Sports, and hit the road with the total confidence that only expert-level support can provide.

Frame CF3 IV - carbon with the same geometry and aeroydanmic profiling as the CF5 IV with a more budget friendly carbon lay up. Tapered headtube, Disc Cooler, BB86 BB standard,142 x12mm axle standard. Max tyre size 700 x 30c
Fork Reacto CF3 IV Disc; material: carbon; 700x30C max. tyre size
Headset Merida Team SL (OP-203 neck)
Stem Merida Expert SL 2PII; material: aluminium; -9 degree rise; Length: (XXXS-XS) - 90mm, S - 100mm, (M-L) - 110mm, XL - 120mm
Handlebar Merida Expert CW; material: aluminium; (XXXS-S) - 380mm wide, (M-L) - 400mm wide, XL - 420mm wide
Grip Merida Road Expert
Brake Type Hydraulic Disc
Brake Lever Shimano 105
Brake Calipers Front: Shimano 105; Hydraulic disc with Shimano RT54; 160mm Rear: Shimano 105; Hydraulic disc with Shimano RT54; 160mm
Tyres Front: Continental Grand Prix; 700x28C; kevlar bead Rear: Continental Grand Prix; 700x28C; kevlar bead
Wheel Size 700c
Wheels Rims: Merida Expert CW; 19mm inner rim width; 30mm rim depth Spokes: Double Butted Black stainless Front Hub: Shimano HB-TC500; 100x12mm; 28 Spoke; Centerlock Rear Hub: Shimano FH-TC500-HL; 12-142mm; 28 Spoke; Centerlock
Speeds 24
Front Derailleur Shimano 105
Rear Derailleur Shimano 105; GS
Shift Levers Front: Shimano 105 disc, Rear: Shimano 105 disc
Chain Shimano M6100-12
Cassette Shimano 105 R7101; 11-34 teeth; 12 speed
Chainset Shimano 105 R7100; 52-36 tooth chainset; Crank length: XXXS - 160mm, (XXS-XS) - 165mm, (S-M) - 170mm, (L-XL) - 172.5mm
Pedals Not included
Bottom Bracket Shimano SM-BB71-41B; Pressfit 86.5
Pedals Not included
Saddle Merida Expert SL; 6% recycled and 23% nature material; V-mount; incl. Merida minitool
Seat Post Merida Team CW; Aero shape; 15mm layback; material: carbon
Colours Silk Black (Glossy Dark Silver)
Sizes L, M, S, XL, XS, XXS
Brand Merida
Model Year 2026
Barcodes 4711256518374, 4711256518381, 4711256518398, 4711256518404, 4711256518411, 4711256518428
SKUs / Part Numbers A62611A00159, A62611A00160, A62611A00161, A62611A00162, A62611A00163, A62611A00164

Please note: Manufacturers can sometimes change the specification of the products from time to time.