Bikes with improved aerodynamics, instead of being lighter, were the main focus in the 2025 Tour de France, indicating a major change in cycling technology and approach.
This development in bicycle design highlights a major pattern. Although cyclists have long idealizedlightweight bikesfor their convenience in climbing and rapid acceleration, recent developments and race outcomes have demonstrated what experts have been emphasizing for years: that aerodynamic efficiency typically plays a more significant role in overall performance.
This control might make you wonder: Should your next drop bar bicycle be aerodynamic? This guide will assist you in making the decision.
The Aero Bike Defined
Nearly all high-performance racing bicycles today feature elements that minimize air resistance. One such feature is internal cabling. Although completely hidden cabling appears visually appealing, its main advantage lies in the aerodynamic improvements it offers.
So, it can be confusing when cycling editors like me refer to “aero bikes” because someone might reasonably question, “Aren’t all racing bikes today aerodynamic?”
Let me, hopefully, provide some explanation. When I/Muara Digital Teamrefer to a racing bicycle, we are specifically discussing bikes that are intentionally created to focus on minimizing air resistance over nearly all other features.
Here is a partial list of racing bicycles designed for aerodynamics:
BMC Teammachine R, Canyon Aeroad, Cervelo S5, Colnago Y1Rs, Giant Propel, Orbea Orca Aero, Ribble Ultra Aero, Ridley Noah Fast 3.0, Scott Foil, Stromm RAKTT, and Van Rysel RCR-F
All-around racing bicycles do incorporate some aerodynamic adjustments, but the primary focus in designing these frames is on maintaining a lightweight structure.
Here is a partial list of all-around racing bicycles: BMC Teamachine SLR, Cannondale SuperSix Evo, Canyon Ultimate, Cervelo R5, Colnago V5Rs, Giant TCR, Orbea Orca, Pinarello Dogma F, Ridley Falcn RS, Scott Addict, Specialized Tarmac, Trek Madone, and Van Rysel RCR.
In essence, aero race bikes tend to be heavier yet more aerodynamic, whereas all-arounder race bikes are lighter but less aerodynamic. However, the distinction between aero and all-arounder bikes is not clear-cut and constantly changing, with some models that don’t easily fall into either group.
When Lighter Weight Means Faster Speed
Everyone, or nearly everyone, enjoys the sensation of a lightweight bicycle. They seem very energetic and responsive to even the smallest movements, conveying speed and performance in a manner that nothing else can.
I’ve also heard the claim (though it hasn’t been proven) that, given the same conditions, a lighter bicycle provides a smoother ride over bumps compared to a heavier one. Based on my extensive experience testing bicycles, I believe there may be some truth to this idea. However, this is a subject for another discussion.
Light bikes feelvery good and very fast, it’s simple to see why people enjoy them and believe they are quicker than a heavier bicycle. Butfeels likeisn’t always identical toactually.
There is only one scenario in which a lighter bicycle outperforms a heavier, more aerodynamic one: during a steep and slow ascent (and solely during that phase).
Even so, the incline’s difficulty and the rider’s pace need to be considered in the calculation. On the same hill, a less strong rider could be faster on a lighter bicycle, whereas a more powerful rider might gain an edge on a heavier but more streamlined bike. Wind speed and direction can also shift the advantage in either direction.
The benefit of a lighter bicycle during a climb is frequently exaggerated, as in reality, even a significant difference in weight between bikes does not lead to a substantially quicker ascent. I’ll use the Hautacam, a crucial climb in this year’s Tour de France, as an example.
Hautacam measures approximately 13 kilometers (roughly 8 miles) in length and has an average slope of 7.8 percent. The rider in our example weighs 155 pounds and is maintaining a steady power output of 200 watts (2.84 W/kg).
Cycling a 14-pound bicycle, they would finish the ascent in approximately 1:13:22.
If they were to ride an 18-pound bicycle, they would arrive at the summit in approximately 1 hour, 14 minutes, and 57 seconds.
Therefore, cycling on a bike that weighs four pounds more (which is considerable) would cause the rider to slow down by approximately 95 seconds (2.14 percent). This difference is significant if you’re a professional athlete or aiming for a Strava KOM, but it’s negligible for everyday cyclists like you and me.
Keep in mind that this is a highly simplified example and does not account for wind conditions, nor any aerodynamic variations between the bicycles.
When a More Streamlined Design Leads to Greater Speed
Unlike a lighter bike, which only provides an advantage during an uphill time trial, a heavier and more aerodynamic bike offers benefits in almost all situations.
“Weight only becomes a significantfactor during steep ascents. However, even on hilly routes, aerodynamic efficiency often has a greater impact on overall speed and performance,”says SwissSidea prominent aerospace consulting and design firm.
You might consider enhanced aerodynamics as achieving higher speed with the same amount of power, requiring less power to sustain a specific speed, or conserving energy over time.
It is accurate that the faster you go, the higher the proportion of your power required to counteract aerodynamic drag. However, this is frequently misunderstood to mean “aero bikes only help faster cyclists.” At all speeds, a rider is constantly battling air resistance. Even at a speed as low as 10 mph,One half of your overall energy is spent fighting against air resistance..
Therefore, there is no scenario in which aerodynamics are irrelevant, and there is only one specific case (steep ascent) where weight plays a more crucial role than aerodynamics. However, even in this particular case, aerodynamics still have an impact.
When you look at the complete experience of a standard ride that features flat areas, inclines, and declines, a more aerodynamically designed bike is consistently quicker.
Here is some evidence taken from my recent tale about theeffect of aerodynamics in the 2025 Tour de France:
To tackle the discussion between weight and aerodynamics,[SwissSide] simulated various bicycle situations during stage 11 of the 2021 Tour de FranceThis stage included four classified climbs prior to the final challenging ascent of the HC Mont Ventoux (15.7 km with an average gradient of 8.8 percent). Interestingly, this stage did not end at the top but instead involved a descent from Ventoux to the finish line.
In their calculations, a solo cyclist—assuming Tour-level speed and power—would save 19 seconds on the Ventoux climb with a bike that is 1,000 grams lighter. However, over the entire 199km stage, the rider using the 1,000 grams heavier but more aerodynamic bike would finish 3 minutes and 16 seconds sooner.
In a tidy summary, SwissSide proclaimsthat, for professional cyclists, the average slope for the whole ride must be 7.5 percent—equivalent to 7,500 meters or 24,000 feet of elevation gain over 100 km or 62 miles—before weight takes precedence over aerodynamics.
For amateur enthusiasts, the gradient decreases to 4.5 percent (4500 meters / 14,764 feet of ascent per 100 km / 62 miles) before weight starts to have a greater impact than aerodynamics.
Aero Bikes and Comfort
Besides the extra weight, historically one of the main disadvantages of an aero race bike — when compared to a lighter, more versatile model — has been a stiffer and less comfortable ride.
Based on my experience testing bicycles, I can confirm that was accurate for the initial models of aero bikes. However, modern aero bikes perform very differently from the first generation of aero bikes.
Enhanced design and carbon fiber configurations, along with broader and lower-pressure tires, have greatly reduced the comfort difference between an aero bike and a versatile model. Modern aero racing bikes are surprisingly comfortable.
However, even contemporary aero bikes typically have a slightly stiffer and less smooth ride compared to an all-around bike. From my discussions with brands that provide frames to elite professional cycling teams, this variation in sensation is often the primary factor influencing a rider’s preference for an all-rounder over an aero bike. That said, certain riders appreciate the additional feedback that an aero bike offers.
The Fit Issue
Above all, the way race bikes fit could influence your choice more significantly than considerations related to weight or aerodynamics.
Both aerodynamic and general-purpose racing bicycles, unsurprisingly, feature a racing bike fit. Their design incorporates geometry that enables riders to adopt a flat-backed riding posture.
In the meantime, frames created to place riders in a more vertical riding posture often emphasize less attention to aerodynamic frame features.
There Are More Affordable Methods To Obtain Aero
Regardless of your role, there are still methods to decrease resistance, which can enhance your speed and effectiveness. You can achieve aerodynamic benefits without spending on an aero bike or other costly items such as wheels.
The way your body is positioned while riding has a much more significant effect on the total resistance you experience compared to the frame and wheels.
You can realize huge aero gainsBy adjusting your posture on your current bicycle to be more aerodynamic, reducing your profile, or using specialized clothing and a helmet designed for aerodynamics.
Is It Worth Riding an Aero Race Bike?
This is a challenging question to address.
You see, modern all-around racing bicycles such as the Tarmac, Madone, and SuperSix Evo are also aerodynamic: they are simply less aerodynamic, yet lighter, compared to aero-focused racing bikes like the S5, Noah Fast, and Y1Rs.
Meanwhile, modern aero race bikes are quite lightweight, so even if you’re not a professional restricted by the UCI’s 6.8Kg minimum bike weight, the weight difference between, for instance, Cervelo’s versatile R5 and the aerodynamic S5 remains minimal when both are equipped with identical components.
Therefore, the issue isn’t: should you opt for a bike that is significantly lighter but not aerodynamic, or one that is aerodynamic but much heavier? The actual question is: do you prefer a bike that is somewhat heavier yet more aerodynamic, or one that is slightly lighter but less aerodynamic?
If your primary concern is speed and efficiency during the entire ride, you might want to choose the aero bike.
If your primary concerns are ascent speed and a smooth riding experience, you might want to choose the all-around model.
However, in reality, modern race frame designs have concentrated on improving both weight and aerodynamics, and they all offer excellent performance as well.
It’s not about what is superior or quicker; it’s about the sensation and what holds greater importance to you. Since when you purchase a contemporary racing bicycle, it will inherently be both lightweight and aerodynamic.
