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The car should drive smooth as silk well past 100mph.
It could be the tire needs re-balancing, in case it lost its weights.
The tire rubber itself if too old or damaged may be developing a problem.
The suspension may be worn and getting loose allowing the shakes to develop at certain speeds.
A rim could be slightly out of round due to hitting a curb but would shake worse proportional to the speed I would think.
Start with the cheapest (rebalance) and work your way through the possibilities.
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"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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