All I have is a comp, an HID, and a backup LED headlight. Not sure why I'd need more than that. I don't actually need the comp, and actually I don't really look at it. It's mainly there for the odometer function so I can keep track of drivetrain maintenance. Also once a month or so I do a couple of days of paying attention to my cadence.
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Work: the 8 hours that separates bike rides.