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This test is totally useless. You are ignoring efficiency by just putting constant power to the chainline and ignoring losses that happen between rider and the rest of the bike. There are few ways to measure this. You can get (rent) a portable VO2 test unit and the rider rides at constant wattages and you measure the oxygen consumption. Or you can get a lactate measuring unit and put the rider to ride constant very high wattages and measure the lactate (probnably not accurate enough). Testing things like this is misleading. Maybe you could consult an engineer or someone that...