Aerodynamic performance and riding posture in road cycling and triathlon

Nathan Barry, David Burton, John Sheridan, Mark Thompson, Nicholas A.T. Brown

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Cycling performance is strongly dependent on aerodynamic drag, of which the majority is attributable to the rider. Previous studies have shown the importance of optimising athlete posture on the bicycle for individual time-trial events. This article identifies that performance in road cycling and draft-legal triathlon can be improved through aerodynamic optimisation of the athlete's posture. Nine relevant cycling postures have been studied, and it was found that for road cycling, gripping the hoods with horizontal forearms can reduce the required cyclist power by 13.4%, and for draft-legal triathlon applications, the use of short bar extensions reduced the required power by up to 16.7%. It was also found that lowering the eyes and head increased drag in both drops and triathlon postures. Measurements of the velocity profiles of the wake of a cyclist in four different postures are presented, and it is shown that differences in drag coefficients between postures can be correlated with changes in the wake velocity defect and turbulence intensity distribution.

Original languageEnglish
Pages (from-to)28-38
Number of pages11
JournalProceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology
Volume229
Issue number1
DOIs
Publication statusPublished - 2015
Externally publishedYes

Fingerprint

Aerodynamics
Aerodynamic drag
Bicycles
Drag coefficient
Drag
Turbulence
Defects

Cite this

@article{b0350c7f70ee4f41b2f4aafc9221e6e2,
title = "Aerodynamic performance and riding posture in road cycling and triathlon",
abstract = "Cycling performance is strongly dependent on aerodynamic drag, of which the majority is attributable to the rider. Previous studies have shown the importance of optimising athlete posture on the bicycle for individual time-trial events. This article identifies that performance in road cycling and draft-legal triathlon can be improved through aerodynamic optimisation of the athlete's posture. Nine relevant cycling postures have been studied, and it was found that for road cycling, gripping the hoods with horizontal forearms can reduce the required cyclist power by 13.4{\%}, and for draft-legal triathlon applications, the use of short bar extensions reduced the required power by up to 16.7{\%}. It was also found that lowering the eyes and head increased drag in both drops and triathlon postures. Measurements of the velocity profiles of the wake of a cyclist in four different postures are presented, and it is shown that differences in drag coefficients between postures can be correlated with changes in the wake velocity defect and turbulence intensity distribution.",
author = "Nathan Barry and David Burton and John Sheridan and Mark Thompson and Brown, {Nicholas A.T.}",
year = "2015",
doi = "10.1177/1754337114549876",
language = "English",
volume = "229",
pages = "28--38",
journal = "Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology",
issn = "1754-3371",
publisher = "SAGE Publications Ltd",
number = "1",

}

Aerodynamic performance and riding posture in road cycling and triathlon. / Barry, Nathan; Burton, David; Sheridan, John; Thompson, Mark; Brown, Nicholas A.T.

In: Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology, Vol. 229, No. 1, 2015, p. 28-38.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Aerodynamic performance and riding posture in road cycling and triathlon

AU - Barry, Nathan

AU - Burton, David

AU - Sheridan, John

AU - Thompson, Mark

AU - Brown, Nicholas A.T.

PY - 2015

Y1 - 2015

N2 - Cycling performance is strongly dependent on aerodynamic drag, of which the majority is attributable to the rider. Previous studies have shown the importance of optimising athlete posture on the bicycle for individual time-trial events. This article identifies that performance in road cycling and draft-legal triathlon can be improved through aerodynamic optimisation of the athlete's posture. Nine relevant cycling postures have been studied, and it was found that for road cycling, gripping the hoods with horizontal forearms can reduce the required cyclist power by 13.4%, and for draft-legal triathlon applications, the use of short bar extensions reduced the required power by up to 16.7%. It was also found that lowering the eyes and head increased drag in both drops and triathlon postures. Measurements of the velocity profiles of the wake of a cyclist in four different postures are presented, and it is shown that differences in drag coefficients between postures can be correlated with changes in the wake velocity defect and turbulence intensity distribution.

AB - Cycling performance is strongly dependent on aerodynamic drag, of which the majority is attributable to the rider. Previous studies have shown the importance of optimising athlete posture on the bicycle for individual time-trial events. This article identifies that performance in road cycling and draft-legal triathlon can be improved through aerodynamic optimisation of the athlete's posture. Nine relevant cycling postures have been studied, and it was found that for road cycling, gripping the hoods with horizontal forearms can reduce the required cyclist power by 13.4%, and for draft-legal triathlon applications, the use of short bar extensions reduced the required power by up to 16.7%. It was also found that lowering the eyes and head increased drag in both drops and triathlon postures. Measurements of the velocity profiles of the wake of a cyclist in four different postures are presented, and it is shown that differences in drag coefficients between postures can be correlated with changes in the wake velocity defect and turbulence intensity distribution.

UR - http://www.scopus.com/inward/record.url?scp=84923649472&partnerID=8YFLogxK

U2 - 10.1177/1754337114549876

DO - 10.1177/1754337114549876

M3 - Article

VL - 229

SP - 28

EP - 38

JO - Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology

JF - Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology

SN - 1754-3371

IS - 1

ER -