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I’ve been a dedicated road cyclist for years, racking up some 63,000 miles according to my Strava app. Like many cyclists, I sometimes suspect I got into it as much for the gear as anything else.

If you ride on the road, even where traffic is light, you are likely familiar with Garmin’s Varia RTL515 radar system. The device combines a rear light with a Varia radar into a compact package. When ...