Last month, the Cyclingnews tech team returned to the unassuming industrial unit that is fast becoming our second home: the wind tunnel at Silverstone Sports Engineering Hub, for the latest in the CN Labs series of empirical group tests, and this, I think, we can call "the big one."
We tested 12 of today's best aero road bikes. Not the aero all-rounders like the Tarmac SL8 or the Madone as tested last year - check out last year's superbike test here - but purebred aero machines with headtubes inspired by the Mariana Trench and radical silhouettes that, in the case of some, probably make Eddy Merckx's eye twitch with contempt.
And our baseline: My very own 2015 Trek Émonda ALR
Each bike was tested under three different protocols, including both with and without a rider, as well as with its own wheels as sold and a standardised pair. Tests were performed at fast amateur road race speeds, across a range of yaws, and with each bike set up to a matching position designed around our test rider.
The resulting feature, all 12,000+ words of it, is exclusive to Cyclingnews members, so I won't give too much away here, but a special thanks must go to every single one of you.
I've said it before, and I'll say it 'til the cows come home: your subscription fee is the only thing enabling us to do these tests, so thank you.
If you're already a Cyclingnews member, you can head to the full test to see our protocols and find the results.
More than anything, we learned that the crazy Factor prototype isn't all bark and no bite.
Visually, with its forward-protruding wide-set fork, bayonet-steerer tube and ultra-deep head tube, it screams "I'm fast" as loudly and persistently as an angry little Terrier that shouts at anyone who'll listen. But whereas little Terry might run away at the first sign of conflict, Factor's bike has the aerodynamic clout to back up its aggressive looks.
It landed top of the pile by a resounding margin in both of our bike-only tests, and fell shy of the winner by less than a tenth of a watt (well within the error margin of our test) when tested with a rider.
Elsewhere, there's a new definition of 'two-speed peloton'. Bikes designed before the UCI changed its rules around tube depths and compensation triangles are consistently slower than those designed since.
Related to the above, there's an obvious trend in aero bikes towards chunky head tubes. The Ridley, DARE, Van Rysel, Colnago, Cervélo and Factor are just some of the bikes launched in the past two years, and they all follow this trend.
Less so in the test data but more something that the test highlighted, is that the UCI's decision to permit more aerodynamic frames in 2023, before threatening to ban deep wheels, narrow handlebars and big gear ratios in 2026 in a bid to slow down the peloton is evidence of the governing body's short-sighted approach to rulemaking.
(Image credit: Josh Croxton)
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Josh is Associate Editor of Cyclingnews – leading our content on the best bikes, kit and the latest breaking tech stories from the pro peloton. He has been with us since the summer of 2019 and throughout that time he's covered everything from buyer's guides and deals to the latest tech news and reviews.
On the bike, Josh has been riding and racing for over 15 years. He started out racing cross country in his teens back when 26-inch wheels and triple chainsets were still mainstream, but he found favour in road racing in his early 20s, racing at a local and national level for Somerset-based Team Tor 2000. These days he rides indoors for convenience and fitness, and outdoors for fun on road, gravel, 'cross and cross-country bikes, the latter usually with his two dogs in tow.
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