The Argon 18 Sum Professional is actually one of many extra fascinating bikes in the marketplace in 2024. The Canadian bicycle producer, based in 1989 by former skilled bicycle owner Gervais Rioux, does not presently have a division one sponsored workforce, and subsequently is not typically seen on our TV screens – however that does not imply the model does not make nice bikes.
The Sum Professional goes toe-to-toe with the finest street bikes in the marketplace throughout all classes, and on the subject of worth and luxury, I believe Argon 18 has plenty of the competitors beat. A prime quality street bike that does not beat you up on a 4-hour trip is not any imply feat to engineer, and I believe Argon 18 has executed simply that.
Argon 18 Sum Professional: Building
The frameset
Argon 18’s new Sum Professional is alleged to mix the very best parts of its predecessors, bringing collectively the aero efficiency of the Nitrogen and the climbing prowess of the Gallium Professional, and aesthetically a minimum of, you possibly can actually see some hereditary options. The Sum Professional represents Argon 18’s most superior carbon layup, which the model says is engineered for optimum energy switch, stiffness, and compliance throughout all terrains. The body can be out there in a barely lower-spec carbon layup, which forgoes the ‘Professional’ branding.
Like just about each modern-day bike in the marketplace, the Sum Professional options an aerodynamic design that started off with advanced Computational Fluid Dynamics (CFD) evaluation. The body’s hourglass-shaped headtube is optimized to cut back drag, and has been made deeper from again to entrance to enhance stiffness. The flared fork legs are formed to direct air away from the downtube, enhancing airflow whereas sustaining lateral stiffness.
These aerodynamic options lead to a claimed 75-second acquire over the Gallium Professional Disc on difficult climbing levels, comparable to La Planche des Belles Filles – claims made utilizing a real-world energy knowledge mannequin.
The Argon 18 Sum Professional follows the ever extra standard pattern of aero up entrance, and lighter weight on the again
(Picture credit score: Future)
However as essential as aero is, an all-round race bike needs to be light-weight too. Argon 18 has managed to maintain the body weight low by slimming down a few of the Sum Professional’s tube profiles, together with the D-shaped seat put up, slender seat stays, and optimized downtube. The result’s a body weight of 850 grams for a painted body, which, for the price of the bike, is pretty respectable. For comparability, the Van Rysel RCR Professional‘s frameset weighs 790 grams for comparative dimension, and the Merida Scultura sits at 830g.
Argon 18 has additionally put plenty of emphasis on the consolation of the Sum Professional, one thing which is blissfully tangible on the street. The Sum Professional provides a powerful mixture of compliance and stiffness, thanks in no small half to these days frequent dropped seat stays and a slimmed-down seat put up. And if you wish to additional enhance the consolation, the Sum Professional has clearance for tires as much as 30mm. That is all stated to contribute to a 30-35% enchancment in rear compliance over the Gallium Professional – I have not ridden the Gallium, however the Sum Professional is decidedly supple.
The construct…
The construct itself is barely extra of a combined bag. Gear adjustments are dealt with by the ever-reliable rock that’s Shimano’s Dura-Ace R9270 Di2, which labored faultlessly. Nonetheless past that, there is a bit more variation.
The Zipp 303S wheels are coupled with Vittoria Corsa Professional 28mm tires
(Picture credit score: Future)
Alongside the Shimano groupset, is a set of Zipp 303s carbon wheels. It’s barely uncommon to discover a Shimano groupset subsequent to Sram subsidiary wheels, however the 45mm deep wheels do make a very good pairing for the frameset. The 1525g wheelset options hookless rims, and are optimized for 28mm tires, which as soon as once more performs into the Sum Professional’s emphasis on consolation.
The cockpit setup is a two-piece affair, not carrying the flare of a one-piece setup, nonetheless, this does have its upsides. FSA gives its ACR stem and SL-Ok compact handlebar for the cockpit, making for a mixture of alloy and carbon fiber up entrance. The mixture of conventional spherical bars, and a barely heavier alloy stem does make the Sum Professional barely much less engaging than a few of its rivals, nonetheless, it does stay barely simpler to alter place post-purchase, which should not go ignored. And this ease of upkeep got here in significantly helpful after we took it to the wind tunnel earlier this yr…
Argon 18 Sum Professional: the trip
I’ve been fortunate sufficient to trip the Argon 18 Sum Professional in a complete host of various capacities, on my common house roads, in addition to within the World’s most costly turbo coach – the Silverstone Sports activities Engineering Hub’s Efficiency Wind Tunnel.
However let’s begin with first impressions. As with all my bike assessments, I initially took the Sum Professional for a 30km shakedown on an area route, which options somewhat little bit of every thing. Steep climbs, some corners I do know nicely, and a few very, very bumpy tarmac. The bike dealt with all of this beautiful nicely, and from the gun felt pretty playful too – one thing not all modern-day bikes handle to harbor.
When taking part in round with handlebar widths within the wind tunnel, I used to be reminded simply how a lot simpler a two piece bar and stem setup is – even whether it is barely slower.
(Picture credit score: Future (Sam Gupta))
However I discovered it was after I took the Sum Professional on an extended jaunt across the Cotswolds that the bike actually started to shine. My house roads in Oxfordshire are identified among the many native biking neighborhood for being in very poor situation, however aboard the Sum Professional, this was far much less noticeable. The body, together with the 28mm Vittoria Corsa Professional tires, had been fantastically supple and did a stellar job at eliminating street buzz.
What makes this high quality fairly so vital, is that the bike stays firmly underneath the race bike class. The Sum Professional does not fairly have the electrical response of one thing just like the Large TCR which I lately examined, however it’s nicely and actually in the identical ballpark and is available in at a decrease price too.
A better take a look at the cam tail down tube, full with some physics revision
(Picture credit score: Future)
I additionally took the Sum Professional on some quicker chaingang group rides with a view to get a really feel for the way the bike dealt with in a barely extra aggressive setting, and as soon as once more it carried out very nicely. The bike feels completely at house when issues get quick and in addition remained very secure when committing somewhat tougher to the corners too.
General, the Sum Professional gives a poised trip really feel, bringing collectively a reasonably aggressive geometry with a carbon layup that permits you to keep comfy for lengthy intervals within the saddle. It is a mixture that, I believe, is good for many ameteur racers. No, it won’t be fairly as stiff as a few of the big-name competitors, however the fact is, there is not an excessive amount of in it – a minimum of not noticeable to us mere mortals.
Argon 18 Sum Professional: worth
The Argon 18 Sum Professional is priced at £8,500/$8,950, and fairly frankly, for the trip high quality you get, I believe that is good worth. For that worth, you might be getting a top-spec groupset, and a high-quality frameset. That stated, I do assume the ending package does let the bike down barely. The ending package is all very succesful, however I do really feel an aero cockpit of some description do wonders to slender the hole between the Sum Professional and a few of the dearer competitors.
An apparent competitor can be the Van Rysel RCR Professional, which is available in at £9000/$ 10,999 for the top-spec mannequin. Although I have not examined this actual spec, I can say that I believe the Argon 18 provides a extra rewarding trip than the RCR Professional when evaluating the framesets, however when you think about the Sum Professional’s barely heavier weight at 7.3kg you’d must say it is fairly shut between the 2.
General, It is excessive reward for the Argon 18 Sum Professional, particularly in case you are a racer trying to take the sting off of rougher tarmac.
