Any bike named after the Cannibal’s total number of professional victories had better be up to the job… and the Eddy Merckx 525R, the new flagship aero bike with progressive geometry, certainly looks ready to devour.
Since 2017 the Eddy Merckx brand has been run by Belgian Cycling Factory, which also owns Ridley and the Bike Valley Aero Performance Lab in Beringen. Quick Step and AG2R have competed on Eddy Merckx bikes in the past – currently there’s no WorldTour team but the brand has partnered with the Flemish development team Flanders-Baloise, originally called Vlaanderen 2002-Eddy Merckx, since 1994. Its alumni – Flandrian hardmen to a man – include Thomas De Gendt, Yves Lampaert, Victor Campenaerts, and Oliver Naesen. Its current crop of apprentice cobbled Classics specialists are currently competing on this new Eddy Merckx 525R (no pressure), so let’s take a closer look.
The approach is broadly in line with the latest thinking on aero bikes: there aren’t many more watts that can be saved by making the frame and fork more aerodynamic without falling foul of the UCI’s equipment regulations, so designers are looking in greater detail at the bike and rider as a system. The rider accounts for 80% of drag, we’re reminded.
“Modern bike fitting principles formed the foundation of the 525R’s development. Combined with extensive validation in the Aero Performance Lab wind tunnel, they resulted in a geometry that enables riders to sustain a faster, more aerodynamic position without compromising comfort.”
One of these geometry features, aimed at optimising rider positioning, is a “progressive” – steeper – seat angle and less saddle setback for a shallower hip angle when used with shorter cranks. Interestingly, though, the 525R's seat tube angle steepens as the frame size increases. In size XS it's 74°, going up to 76° for size L. Traditionally it’s the opposite – the seat tube angle slackens as frame size increases.
According to Pieter Potters, head of product at Belgian Cycling Factory: “This traditional approach leads to a significant increase in setback of the saddle relative to the bottom bracket as the saddle height increases… Taller riders often struggle to get the desired modern bike fit on bikes with a traditional geometry, having to resort to a seatpost with a more forward saddle clamp combined with moving the saddle forward as much as possible. This often needs to be combined with long stems to compensate for the loss in reach to the handlebar. These long stems have a negative effect on the handling of the bike.”
It's difficult to think of a single other road bike that features a seat tube angle that steepens rather than slackens as the frame size increases. The Ridley Noah Fast, the flagship aero bike of Eddy Merckx's Belgian Bike Factory sister brand, has a seat tube angle that slackens as frame size increases. Even the new Felt Nexar, held up as an example of modern aero bike geometry with its steep seat angle, zero-setback seatpost and high stack, also does it the traditional way.
To work with the effective shortening of the saddle-bar measurement and to bring stems back to a proportional length, the 525R’s reach has been extended, creating what the brand calls “a balanced and powerful riding position that enhances both efficiency and control”. This also appears to be the opposite of the current trend for shorter reach.
In addition, there’s a lower bottom bracket height to lower the rider’s centre of gravity, improving stability and confidence at higher speeds – made feasible of course by bigger tyres and shorter cranks.
The stack height is flagged in the press release as higher too, though the stack/reach ratio of the size 56, with its extended reach, works out at 1.38. By comparison the Felt Nexar is 1.47, the Factor Ostro VAM is 1.44 and the Specialized Tarmac SL8 1.43.
All these geometry revisions don’t mean that frame aerodynamics have been completely overlooked: there’s a claimed 9% drag reduction compared with the 525R’s predecessor. It sounds like a lot, but the outgoing 525 hadn’t changed shape since 2019, when it was ridden by AG2R and was more of an all-rounder than an aero bike.
The savings have been made via a much deeper head tube that pushes to the limits of UCI regulations, and a profiled down tube that’s optimised for mounted water bottles. Meanwhile, an asymmetrical fork profile is claimed to improve stability in crosswinds, and a diffuser-style fork crown guides airflow more efficiently around the down tube to reduce drag. Further back is a slim aero seatpost with an integrated clamp.
The 525R has a claimed frame weight of 952 grams in size M. There’s no comparison with the previous 525, but since that was an all-rounder with much shallower tubes, it’s unlikely that the new bike is lighter.
Other notable features: it has a UDH interface, a removable front derailleur hanger for 1x setups, 34mm of tyre clearance and CeramicSpeed SLT headset bearings that have a lifetime warranty.
The 525R can be fully customised to suit your personal taste using the online configurator, with groupset choices including SRAM Red, SRAM Force, Shimano Dura-Ace, Shimano Ultegra and Campagnolo Super Record. Prices for a complete bike start from €6,499 with SRAM Force 1x13 and the Campagnolo Super Record build with Bora wheels is €12,999.
There’s a special launch edition that’s limited to 100 units: “The Launch Edition is defined by a deep raw carbon base layered with a shifting, iridescent finish that plays with light and movement. It’s subtle at rest and dynamic at speed." Beautiful though it is, I have to admit I would stick with the classic white-and-red Faema tribute paint scheme.
In another upturning of tradition, the price of the Launch Edition is closer to the entry-level build than to the flagship one at €6,999.
For all the details and pricing visit the Eddy Merckx Bikes website.
