Remember ladies that the mechanics of bicycles are pretty fundemental, and they are made to go at speed that people can take them too.
When we go downhill, we take bikes to speeds that begin to challenge their frames.
The speed wobbles is most likely a combination of the weight distribution on the bike, the wind resistance or direction, the increasing speed and the way you apply the brakes.
When braking downhill, feather the brakes, don't just apply and hold tight - that will cause a sudden change in resistance and not allow the bike time to adjust.
I also use a combination of braking both wheels, though I don't know if that is recommended, but it works for me.
Have fun experimenting, Runaway... I'm sure those Goddesses of cycling will continue to watch your technique and guide your wheels



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