Comparative analysis of lenticular and spoked wheels in track cycling: selection criteria by discipline, CdA quantification and banked-corner stability

Wheel configuration constitutes one of the three material decisions with greatest chronometric impact in track cycling, together with tubular selection and postural adjustment. The rear lenticular (disc) wheel represents the established technical consensus; the selection of the front wheel, in contrast, requires a specific analysis of the interaction between aerodynamic properties, directional stability in banked corners and environmental conditions of the velodrome.

Technical consensus: rear lenticular wheel

The totality of wind tunnel studies with instrumented mannequins and of real-velodrome measurements converge on the magnitude of the effect: the substitution of a conventional multi-spoke wheel with a rear lenticular produces a saving of 4-7 W at 55 km/h, incremented to 8-11 W at 65 km/h (Barry et al., 2020). Under conditions of a covered velodrome without significant crosswind, no technical arguments justify substitution of the rear disc. The only documented exception corresponds to the Olympic sprint segment with immediate proximity leadout by the adversary, where the additional mass of the disc may marginally affect initial acceleration.

For the set of disciplines of individual pursuit, team pursuit, kilometre time trial, madison and points race, the selection of rear disc constitutes the reference configuration without practical exception.

Technical analysis: front wheel selection

The front wheel remains directly exposed to aerodynamic flow and its geometry affects CdA non-linearly. Usual options in the track cycling market include:

• Full front lenticular: minimises CdA under calm air conditions. Suboptimal behaviour in banked corners under residual wind.
• Tri-spoke (Zipp 900, HED Jet Trispoke): provides 90% of the aerodynamic benefit of the lenticular with superior lateral stability. Predominant configuration in the world elite segment during the 2024-2026 period.
• Five- or six-spoke multi-spoke (Corima Aero+, Lightweight Autobahn): compromise configuration. CdA lower than conventional multi-spoke but higher than tri-spoke. Differential advantage in reduced weight (550-650 g), relevant in sprint disciplines.
• Deep conventional profile (60-80 mm): lower CdA in absolute terms but greater weight and superior directional stability. Configuration recommended for training on competition equipment.

Aerodynamic data by configuration

The values presented correspond to measurement of the total CdA of the cyclist-bicycle system with teardrop helmet and skinsuit textile for a reference cyclist in pursuit posture:

The chronometric dispersion between optimal and suboptimal configuration reaches 3.8 seconds over 4 km. In a competitive context where international-level finals are resolved in margins below 0.5 s, this magnitude does not admit marginal consideration.

Aerodynamic limitations of the front lenticular on the velodrome

The hypothesis of total absence of wind in a covered velodrome does not hold in practice. Climate control systems induce residual flows of the order of 0.5-1.2 m·s⁻¹, and the simultaneous passage of other cyclists on the track generates non-negligible local turbulence. A full front lenticular wheel presents a high rotational moment and responds to any transverse perturbation with a lateral response demanding steering compensation. On a 42% banked corner, this response translates to line loss.

The tri-spoke wheel presents approximately 40% of the lenticular's angular moment at comparable inertia. The biomechanical sensation described by athletes is one of greater directional cleanliness in corners. The associated aerodynamic cost is 0.002-0.003 in CdA (0.4-0.7 seconds over 4 km), a penalty many cyclists accept in exchange for directional stability. In the 2024 Olympic finals, more than 65% of male individual pursuit participants used front tri-spoke configuration.

Team pursuit: asymmetry by position

In team pursuit, riders in positions 2, 3 and 4 remain not directly exposed to primary aerodynamic flow. The positional drafting effect reduces the sensitivity of the front wheel to flow perturbations. Consequently, the installation of front lenticular wheel on the three subordinate riders is operationally advantageous: CdA minimisation under conditions of flow already organised by the leader. The lead rider may maintain tri-spoke configuration by stability criterion, or adopt lenticular in velodromes with verifiably stable flow conditions. This configuration asymmetry is common practice in teams with sufficient technical resources.

Operational exception: Olympic sprint and keirin

The rear lenticular wheel recommendation presents a documented exception in keirin and Olympic sprint series, where acceleration from low velocity and line changes dominate technical execution. A rear lenticular wheel presents a mass 300-500 g greater than the equivalent aerodynamic multi-spoke and a substantially higher moment of inertia. In a 200 m sprint, the inertial component of initial acceleration exceeds in relative importance the aerodynamic benefit in cruise regime. In this context, numerous elite sprinters opt for rear tri-spoke configuration.

References: Barry, N., Burton, D., Sheridan, J., et al. (2020). Aerodynamic drag interactions between cyclists in a team pursuit. Sports Engineering, 23, 5. Godo, M. N., Corson, D., & Legensky, S. M. (2011). A comparative aerodynamic study of commercial bicycle wheels using CFD. AIAA Aerospace Sciences Meeting. Zipp Speed Weaponry (2024). Aerodynamic Performance Report. AeroCoach (2024). Track Wheel Database. Blocken, B., Toparlar, Y., van Druenen, T., & Andrianne, T. (2018). Aerodynamic drag in cycling. Journal of Wind Engineering and Industrial Aerodynamics, 182, 128-145.