With a .230 CdA, you'd need ~105 watts to overcome aero drag at 20.8 mph. With another 3% lost to drivetrain inefficiency, that would mean you have 115 watts of rolling resistance. Either you have the WORST. TIRES. EVAR. Or the .230 CdA is way below reality. Or the power meter is reading way high. I'm gonna guess one of the latter two.

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"They're made of latex, not nitroglycerin"