The Trace and TraceR Reakt Mk3 light set pairs a steady headlight with a taillight that reads the road behind us. The TraceR's ReAKT sensor flares from 75 to 120 lumens the moment we brake or ride into a darker street, so it works without a manual switch mid-ride. Up front, the Trace matches that same daylight logic with its own DayBright pulse pattern, built to stay visible in direct sun. Both units share one compact anodized aluminum housing, so the set behaves as a single system rather than two separate lights bolted together. What Our Gearhead(R) Experts Are Saying:"I braked hard at a light in full sun and watched the rear flare up in my mirror before I'd even finished squeezing the lever. That's the moment this set earns its price over a basic blinker pair."