The reflectors are on the sides of the bike. If a car is close enough to you to see them, it's already too late.
I disagree, I've seen bicycles from a great distance because of the reflectors.
I personally like the idea of reflectors, I too have a black bike. I do the the big round ones are a bit on the gaudy side, so I changed mine to rectangled one like come on the R1.
Kevin
OK but if your a long way off it doesn't matter anyway.
Simply put the stock reflectors are an outdated DOT leftover. They aren't going to do anything to help you been seen in any way that improves our safety.
Most 80 something percent of bike accidents happen from the front 3/4s an angle where the stock reflectors do nothing.
So can those stock reflectors and get some reflective tape on your machine and your helmet if you really want to be seen, but the stock reflectors are mearly lip service paid to the DOT by the OEMs.