Effects of different lubricants on bicycle chains: tribological and ecological study
Keywords:Friction, cycling, chain, tribology, efficiency
Among the forces a cyclist has to overcome, chain drive frictions represent up to 3.9% of the losses in efficiency (Kyle 1986, Atkinson 2003). Lubrication seems to have an impact on these losses (Michelsen 2015), as better lubes can reduce frictions by 2.1%. Though, no study was made in real locomotion conditions. This study investigates the impact of different lubricants on chain’s friction forces measuring the power output in real locomotion conditions. The effect of three different lubricants on the coefficient of friction (Fc, dimensionless) and mechanical cost (Mc, J.m-1.kg-1) were tested using mechanical test and exercise performed with bicycle respectively. Differences between lubes were found in tribological study as some of them have a lower Fc than others. However, no differences were observed for the on-field measurements between the lubricants. This means that the tribological tests do not reflect accurately what occurs in the bike transmission. In order to put a link between the very accurate measures of tribology and the less accurate measures performed on-field, a friction bench device should be envisaged.
How to Cite
Copyright (c) 2021 Journal of Science and Cycling
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Authors contributing to Journal of Science and Cycling agree to publish their articles under a Creative Commons CC BY-NC-ND license, allowing third parties to copy and redistribute the material in any medium or format, and to remix, transform, and build upon the material, for any purpose, even commercially, under the condition that appropriate credit is given, that a link to the license is provided, and that you indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
Authors retain copyright of their work, with first publication rights granted to Cycling Research Center.