Aero road bike in wind tunnel testMerida Reacto One with top value

Robert Kühnen

 · 06.04.2026

With 24 centimetres between the brake levers, it would be narrow according to UCI regulations - a wider model is on offer, although the lower link remains the same
Photo: Wolfgang Papp
Aero racing bikes want to be the fastest on the road. The fifth edition of the Merida Reacto shines in the wind tunnel with top values. The racer combines top aero performance with good all-round suitability. You can find all the details in our detailed laboratory and practical test.

Verdict on the Merida Reacto One Passion test

The fifth edition of the Merida Reacto shines with refinements and combines top aero performance with good all-round suitability

Test result

PropertyGrade
Lab1,9
Equipment1,0
Final grade1,8

You can find the full bike rating here

Data and facts about the Merida Reacto One Passion

Weight7.66 kg
DrivetrainShimano Dura Ace Di2/Classified
Front brakeShimano Dura Ace
WheelsetDT-Swiss ARC 1100/ARC650
Front tireContinental Aero 111 29-622

Measurements

Area of application
Tour
100
Wettkampf
Handling
agile
100
stable
0
33
66
100
Sitting position
sporty
90
comfortable
0
33
66
100

You can find all measurements here

The basic shape of the Reacto is reminiscent of its predecessors, but every tube profile and every tube node has been optimised. A closer look reveals far more complex transitions than before, such as the striking edges on the headset. The modifications give the bike a more refined look, which is also helped by the strikingly designed cockpit, which is narrower than permitted by the UCI: 24 centimetres from grip to grip. The legal minimum is 28 centimetres. But the developers were so taken with the narrowest handlebars that they didn't want to do without them on their private bikes and let us share in the fast riding experience.

Top 2 aero value in TOUR history

Aerodynamics experts from wheel manufacturer Reynolds helped with the development. After preliminary computer work, different variants were tested in wind tunnel sessions and the version that offered the best performance was finally selected. And it has it all. The Reacto makes a big leap forward and improves from 208 to 197 watts, which is the second-best value we have ever measured for a production bike. Development usually takes place in much smaller steps.

This huge improvement is the result of a holistic approach. Not only have the frame, fork and cockpit been improved, but the add-on parts have also been carefully selected, at least for the One version, which we tested and which is trimmed for maximum speed. The wheels and aero tyres are perfectly matched. As a result, the front wheel does not stall during our 20-degree turn. The slim head tube and lower fork blades are noticeable at the front. The last two to three watts are provided by the Classified hub gear, which saves the front derailleur, together with the aero chainring.

The long haul can come

The riding experience is familiar, but faster. The geometry is almost comfortable compared to the other extremists, somewhat calmer overall, but not boring. The narrow handlebars take some getting used to when pedalling out of the saddle, but after a break-in period they are probably no longer bothersome. The legal handlebar version only moves the levers apart, the lower link remains the same. This means that the familiarisation phase is presumably shorter, but the top speed is lower; the brake lever position with arms folded down regularly proves to be the fastest in measurements with a rider. The bike rides safely, has good suspension for an aero racer and accommodates tyres up to 35 millimetres wide. The ride feel can therefore be tuned as desired. The fitted 29/30 millimetre combination already provides suspension comfort on normal roads, but even bad roads are no problem with wider tyres. The weight is slightly higher at 7.7 kilos, which is a tribute to the innovative hub gear system. All in all, the Reacto One is the best all-rounder among the superbikes because it is free of any restrictions. This also results in the best overall score in this test. The bike can handle cobblestones, but is also a joy to ride on a fast home circuit. It can be ridden uphill and downhill without compromise. If you want a fast road bike for everything, the Reacto One is an excellent basis. The price is high, but not exorbitant. For 10,999 euros in top equipment, the value for money is higher than with some other brands, especially as a Rotor power meter is also included.

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