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Pointless cycling gear: Ceramicspeed pulley system
IHPVA studies http://www.ihpva.org/HParchive/PDF/hp50-2000.pdf http://www.ihpva.org/HParchive/PDF/hp52-2001.pdf Calculations: 250W input. 95% assumed drivetrain efficiency. Thus losses on the drivetrain: 12.5W. 5% of losses are on the derailleur pulleys Thus possible loses on the pulleys: 0.625W Friction reduction due to pulley size: 11/17 thus friction lower by 34%. Total savings: 0,225W or 0,09% of total power input.