[Research Review] Aerodynamics and Rolling Resistance of Carbon Wheelsets with Different Rim Depths under Various Yaw Angles: A Study of Elite Athlete Physiological Characteristics (No. 755)

Reference Journal Source: Journal of Wind Engineering and Industrial Aerodynamics • International Scientific Research Review Series

This article explores the aerodynamic and rolling resistance characteristics of carbon wheelsets with different rim depths under various yaw angles.

The Trade-off between Rim Depth and Crosswind Sensitivity

Wheelsets with deeper rims offer more significant aerodynamic drag savings when facing headwinds or small yaw angles, because the deeper profile more effectively guides airflow and reduces vortex separation. However, deeper rims also mean a larger side surface area exposed to the wind. At larger yaw angles (especially in the 15–20 degree range), deep-section wheelsets experience greater lateral moments, raising the challenge for handling stability.

Yaw Angle and Wheelset Handling Comparison

Modern wheelset designs have adopted “NACA-like” airfoil profiles, allowing deep-section wheelsets to generate a “sail thrust” effect at moderate yaw angles (due to delayed flow separation). However, once the yaw angle exceeds a certain critical threshold, the lateral moment still rises sharply—this is the physical reason why deep-section wheelsets become more challenging to ride in strong crosswind conditions.

Drag and Lateral Moment Comparison across Rim Depths (Illustrative)

Core Research Conclusions and Practical Recommendations

• Race-day weather assessment: Check the wind direction and speed forecast before the race. When strong crosswinds are expected, the handling stability advantage of shallow-to-medium rim wheelsets often outweighs the drag savings of deep rims
• Front/rear wheel pairing strategy: The front wheel’s exposure to crosswind moments affects handling more directly. A common strategy is to use a shallower rim on the front and a deeper rim on the rear, balancing handling and aerodynamic efficiency
• Rider weight and handling skill considerations: Lighter riders or those with less handling experience face higher risks when using deep-section wheelsets in strong crosswinds and should choose more conservatively
• Rolling resistance should not be overlooked: Beyond the discussion of rim depth and aerodynamics, the rolling resistance of tires and the wheelset itself also affects overall efficiency—decisions should not be based solely on rim depth numbers

Common Research Q&A (FAQ)

Q: Are deep-section wheelsets absolutely faster in a completely windless time trial?

A: In an ideal straight-line time trial scenario with no crosswind, the drag-saving benefit of deep-section wheelsets is indeed more pronounced. However, real race conditions are rarely completely windless, so the day’s wind conditions still need to be considered comprehensively.

Q: Do amateur riders need to buy deep-section wheelsets?

A: The benefits of deep-section wheelsets are only clearly demonstrated in high-speed, long-straight-line scenarios. If your riding consists mainly of climbing, urban commuting, or varied terrain, medium-to-shallow rim wheelsets are usually more practical.

References and Academic Citations

1. Journal of Wind Engineering and Industrial Aerodynamics — Research directions related to the crosswind aerodynamics of bicycle wheelsets.
2. Sports Engineering — Literature on the interaction between wheelset rim depth and rolling resistance.

Related Reading

• Research Review: Aerodynamics and Rolling Resistance of Carbon Wheelsets with Different Rim Depths under Various Yaw Angles: A Study of Elite Athlete Physiological Characteristics (No. 398)
• Research Review: Aerodynamics and Rolling Resistance of Carbon Wheelsets with Different Rim Depths under Various Yaw Angles: A Study of Elite Athlete Physiological Characteristics (No. 920)
• Research Review: Aerodynamics and Rolling Resistance of Carbon Wheelsets with Different Rim Depths under Various Yaw Angles: A Study of Elite Athlete Physiological Characteristics (No. 1055)
• Research Review: Aerodynamics and Rolling Resistance of Carbon Wheelsets with Different Rim Depths under Various Yaw Angles: Latest Academic Literature Review and Training Practice (No. 983)