Six months. That's apparently how long it takes to buy a company, retool their product, and sell it under a new name. Garmin's new Varia Rearview Bike Radar is a rear light that scans up to 140m behind a bicycle for traffic. It then hands that data on to either a compatible Garmin Edge system or a standalone handlebar-mounted unit with an array of lights to warn riders of what's behind them and how fast it's approaching. If you're a keen cyclist, this idea may sound a little familiar. Startup iKubu made a little splash last year with Backtracker, which was essentially the same thing but a little rougher around the edges. Garmin bought the company back in January, and apparently wasted no time turning the Backtracker into what you see above.