In the world of professional cycling, where every detail counts, bike set-ups are subject to continual scrutiny and evolution. The familiar sight of WorldTour bikes with slammed stems—low, aggressive, and aerodynamic—may be undergoing a transformation, suggests GCN’s Alex Paton.
The slammed stem configuration, characterized by minimal or no spacers beneath the stem, has long been favored by riders aiming for the lowest, most aerodynamic position possible. However, this setup has also been associated with discomfort and potential back issues for amateur cyclists mimicking the pros’ positions.
According to Paton, there’s a noticeable departure from the slammed stem trend among riders at the 2024 Giro d’Italia, with an increasing number opting for more spacers beneath their stems.
The rationale behind the slammed stem lies in aerodynamics. Lowering the front end of the bike helps flatten a rider’s torso, reducing drag—the primary foe in cycling performance. This technique has been a staple of bike positioning for decades, aligning with the pursuit of enhanced aerodynamic efficiency in the peloton.
Nevertheless, Paton observes a potential countermeasure among certain pros: raising the handlebars to expose less of the arms to wind resistance. By adjusting the handlebar height and maintaining the torso’s position through arm flexion, riders can attain a more aerodynamically advantageous forearm position relative to the wind.
Cycling’s relentless pursuit of aerodynamic gains is underscored by advancements in wind tunnel testing, where riders refine their positions for optimal aerodynamics. The emergence of more spacers beneath stems at the Giro d’Italia prompts speculation: are these adjustments solely driven by aerodynamic considerations, or could rider comfort also play a role?
As the Giro unfolds, the evolving bike set-up strategies on display suggest a dynamic interplay between performance and comfort in the quest for competitive advantage. The adoption of new configurations could signify a broader shift in aerodynamic thinking within the professional cycling sphere.