I picked up my new Trek 5200 today. I was in such a hurry to use it I didn't think to tell the LBS to remove the silly reflectors; I thought I'd do it later. Well, I did a circuit in Vancouver out near UBC which has a long steep hill. According to the computer I was at 65 kmh, and was all ready to REALLY open it up and shoot for 80+km/h when I hear a bizarre rythmic whistling whump-whump sound in rapid fire. It was the rear reflector that had somehow partially come loose! Needless to say I wrenched it off there and then and took it easy from there on out. My advice to anyone buying a bike with those reflectors is to have the LBS not even put them on.