Rode Schaeffer by myself today around dinner time. I brought the GPS along but left the recording off so I did't have to pay attention to the speed or distance. I held back a little but kept rolling for about one and half hour without a break. The ride turned out to be quite enjoyable.
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Replaced the rear G2 rotor on the Vicious with an old/heavy one came with BB7. That seemed to have alleviated the noise and vibration problem.