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Related Experiment Video

Updated: Jul 12, 2026

A Rapid Method for Modeling a Variable Cycle Engine

A Rapid Method for Modeling a Variable Cycle Engine

Published on: August 13, 2019

Cycling performance and mechanical variables using a new prototype chainring.

Lucien Belen¹, Mickaël Habrard, Jean Paul Micallef

¹Laboratoire Efficience et Déficience Motrices, EA 2991, Faculté des Sciences du Sport, Université de Montpellier 1, 700 Avenue du Pic Saint Loup, 34090, Montpellier, France. lucien.belen@univ-montp1.fr

European Journal of Applied Physiology

|September 5, 2007

Summary

A new prototype chainring (PC) was tested against a standard chainring (SC) for supra-maximal cycling performance. The PC did not improve cycling speed or mechanical variables like torque and power output compared to the SC.

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Area of Science:

Sports Science
Biomechanics
Cycling Performance

Background:

Standard chainrings (SC) have limitations in optimizing torque and minimizing dead points during the pedal cycle.
A prototype chainring (PC) was developed with features to alter crank-arm alignment and lever-arm length, theoretically improving cycling performance.

Purpose of the Study:

To evaluate the impact of a novel prototype chainring (PC) on supra-maximal cycling performance and key mechanical variables.
To compare the PC's effectiveness against a standard chainring (SC) in trained male cyclists.

Main Methods:

Eight trained male cyclists completed a 1-km "all-out" cycling test using both SC and PC in a randomized order.
Measurements included time to complete the test, torque, crank velocity, and power output.
Statistical analysis employed a two-way ANOVA for repeated measurements with Newman-Keuls post hoc tests.

Main Results:

No significant differences were observed in cycling performance (time to complete 1 km) between the SC and PC.
Key mechanical variables, including torque, crank velocity, and power output, were also comparable between the two chainring types (P > 0.05).

Conclusions:

The prototype chainring (PC) did not demonstrate any significant advantage over the standard chainring (SC) in improving supra-maximal cycling performance.
The theoretical benefits of the PC's design, such as reduced dead points and altered torque profiles, were not substantiated by this study's findings.