Wheel Vibration

While fixing my gears I noticed that when I spin the rear wheel very fast (ie as fast as my arm will spin the pedals in the highest gear) it vibrates quite a bit. Both front and rear wheels have a single reflector clipped on to the spokes which I think may be the cause of the imbalance. Is this a problem?
Do I have to get two more reflectors to balance it all out?
Do I have to get two more reflectors to balance it all out?

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Too true.....probably best getting some snap on ankle/wrist bands using scotchlite reflective material then at least they have the dual use of making you visible when you raise your arm to signal.