AVR-Chat

Hi everybody I have been hanging around here for a while, great forum.
Do any of you have any experience with accelerometers? I am thinking of 
a project using an accelerometer to measure angles. The idea is this: 
the accelerometer will be on the outer edge of a wheel. As the wheel is 
turned the position of the accelerometer will move then using a bit of 
grigonometry I can calculate the angle that it has moved through. My 
question is how much accuracy can I get. I will be looking to measure 
fractions of a degree on the wheel aprox 4 inches or 100mm in diameter. 
Doing the maths gives a movement of about .88mm/degree so I would like 
to be able to detect movement of about 0.2mm is this realistic?
Cheers Rich