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BuRn__ said:
ive had car tires that were out of balance, and it caused a shake at any speed, just varied depending on the speed. this only happens at a certain rpm range.
It's very likely that an out-of-balance tire will shake only at certain road speeds or only above a certain road speed. Is it totally engine speed dependent or road speed dependent?

If road speed, suspect the tire balance. If really engine speed, it may be engine vibration induced. The front forks may somehow have a natural frequency related to engine vibration at certain rpms. Might also want to check that all front end bolts are tight.
 

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BuRn__ said:
if the tire was out of balance, wouldnt it tend to "hop" more than "shake"? cuz the front tire will shake to the left and right very rapidly.
Not necessarily. The vibration could be up/down or left/right. You might also check if the wheel is true. While spinning freely and steering held in one position (like on a front stand or wheel on a balancing machine), does the edge of the wheel move side-to-side compared to a fixed reference?
 
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