108s Wheels size

Hello guys prob a dumb question to most of you but ... is there an easy way to measure the size of the 108s without taking the wheels off ie whether 8 or 8.5. have horrible feeling my rears have been fitted with 225 as i think this is possible. Cheers in advance Steve
 
I believed so but what i need to know is how you check without removing. I have measured from the back of the wheel to the edge of the lip of the star and i get half inch difference :? is the a correct or viable way of telling the different sizes. Steve
 
Link to the 108s on the OEM site just to confirm:
http://bmwfans.info/parts/catalog/E85/Roadster/Europe/Z4_2.5i-N52/LHD/N/2005/august/browse/wheels/bmw_composite_wheel_star_spoke_108/

AND your method of checking the sizes seems reasonable as a quick check.
 
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