Are drop-bar TT bikes coming for WorldTour road races?

Cannondale has officially unveiled its new third-generation SuperSlice time trial offering, the first update to the brand’s TT platform since 2021. As you might expect, there’s been a fair few changes in TT bike design in those five years, like deeper fork blades and modified tube profiles now possible due to a change in UCI rules.

The new SuperSlice takes advantage of those and other trends. It offers increased tyre clearance (32 mm), makes some tweaks to the steering geometry, and adopts Cannondale’s Delta Steerer, which allows for a narrow head tube while integrating cable routing. There's also a new base bar and mono-riser system designed to simplify adjustability.

Fit adjustability was clearly a design priority. The new front end provides wide pad stack and reach ranges, along with stepless extension angle adjustment, while the seatpost offers 45 mm of fore/aft movement, enabling effective seat tube angles from 74–77°. Cannondale claims a 14% reduction in frameset drag versus the previous SuperSlice, equating to a 10-watt saving at 50 km/h. Despite visibly deeper tube profiles, the new frame is said to be only 60 grams heavier, with increased head tube and bottom bracket stiffness and largely unchanged geometry.

But none of that is why I am particularly interested in the new SuperSlice, even if it is very relevant to the idea of road racing with drop-bar TT bikes I’m about to get into.

The demise of the aero road bike is greatly exaggerated

If you’ve read my review of the new Gen 5 SuperSix Evo, you’ll know that while it is a great bike and I have a lot of time for the SSE platform, I’m not convinced the updates merit a new frame, nor the geometry updates. Sure, it has its merits, but they don’t lie in performance, and they certainly don’t answer cries to bring back the aero SystemSix – officially discontinued just over a year ago – or cater to more progressive fits many riders are adopting.

Cannondale’s new SuperSix is more Evo 4.5 than Evo 5The more everything changes, the more it stays the same.Escape CollectiveRonan Mc Laughlin

To be fair, it’s not just Cannondale. Specialized kicked off the most recent wave of brands ditching the aero bike in favour of a “do-it-all” platform when it dropped the Venge platform from its lineup in 2020 and introduced the aero-influenced Tarmac SL7 that same year. Trek did similar when it merged the aero Madone and lightweight Emonda platforms, as did many other brands. In fact, to be even fairer, the likes of Pinarello have always touted the one-bike solution, since first introducing aero to its Dogma platform with the F8 some 12 years ago.

But reports on the death of the dedicated aero bike are greatly exaggerated. The category is showing signs of a strong return amidst the increasing speeds of pro racing. The wide adoption of performance engineering teams within WorldTour teams has highlighted the role of aerodynamics at those speeds, along with a rise in demand within the market.

So is it time to bring back the aero road bike? For brands pursuing a do-it-all platform approach to road racing, there might be a simpler solution hiding in plain sight: a way to satisfy the need for a dedicated aero platform without necessarily reincarnating the models they have killed off, while simultaneously leapfrogging to that category’s logical endpoint.

How a drop bar SuperSlice might look, as Photoshopped by a Photoshop novice.

The question is: Could time trial frames actually be the next step for aero road bikes? Could they be the dedicated, no-compromise, all-out aero bikes some are crying out for, simply hiding in plain sight all along? Could TT frames, often considered necessary evils by WorldTour manufacturers, actually provide an attractive solution to riders, teams, brands, and brands alike? In other words, could the new Cannondale SuperSlice actually be the new SystemSix it refuses to make?

It’s an idea I’ve revisited time and time again over the years, exploring the idea of building a tongue-in-cheek ultimate aero road bike. In fact, I remember asking Cadex if it could make a drop bar for its top tube-less Tri bike at Eurobike 2021, and more recently with Factor and its new Slick tri bike and Cérvelo when I thought for a second the S5 and P5 may share cockpit mounting dimensions (alas, they do not).

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But it’s no longer just a fun thought experiment. Some brands and teams I've spoken with are already exploring it and producing prototype handlebars to test the concept. It’s all made possible by a tweak to UCI rules to harmonise frame approval across disciplines, the trend towards more progressive road positions, and the more general “aero enlightenment” happening within the peloton.

Colnago has produced a prototype drop bar for its TT1, BMC is exploring the same with the new Timemachine project we’ve been following, and Factor tested a drop-bar configuration of its Slice triathlon bike when developing its new One aero road bike. While I know many amateur riders will be screaming, "I did this years ago!" (We couldn't have this article without a mention for George Fox's 10-mile road bike TT national record from 2024.) Not to mention all the track pursuit frames that simply see a handlebar swap ahead of bunch races.

I get a sense of momentum building behind the idea and we may see it trialed (sorry) in the WorldTour peloton as soon as this season. Whether it truly solves the challenges teams and brands face in optimising the bikes WorldTour riders race is another matter, but the drop-bar TT bike is almost certainly coming for the sport.

Optimised into compromised performance

In truth, it’s the optimised amateur who most laments the disappearance of these dedicated aero platforms. It’s not an exaggeration to say most of the top teams and riders could learn a thing or two from the amateur ranks about what’s happening in terms of optimisation. But that also doesn't get to the heart of teams' and brands' challenges.

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