Lubricant selection plays a crucial role in optimizing bicycle drivetrain efficiency by minimizing energy losses due to friction. The long-term characterization of lubricants over the full lubricant life in cycling remains underexplored. This study evaluates the performance of various lubricants, including immersion-style wax-based and drip-style wax emulsion lubricants under realistic cycling conditions using a custom-designed testing rig. Unused 11-speed chains were stripped of factory lubricants and treated with commercially available and custom lubricants. The performance of these lubricants was assessed through repeated efficiency tests and usage interval cycles. The results indicate that the best immersion-style wax lubricants were highly durable, repeatable, and provided consistent drivetrain efficiency over a long period (>60 h). However, some of them required a break-in period to reach maximum performance. Drip-style wax emulsion lubricants were less repeatable. One drip lubricant outperformed the best immersion-style wax lubricant under higher-speed conditions, suggesting that lubricant choice can be tailored to specific riding conditions to maximize efficiency. The insights gained from this study could provide guidance for cyclists, mechanics, and manufacturers in selecting and applying lubricants to enhance drivetrain efficiency and longevity, ultimately contributing to improved cycling performance and reduced component wear.
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