It's amazing what you can find when you search!!
http://www.xoutpost.com/x5-e70-forum/...?highlight=hub
Someone should make this sticky in the tire section or something. I need measure my rim hub sizes to make sure they are in spec. They should be the larger bore size of 74.1 for the e70 style 177 20" rims.
Does anyone even make rings that small? Is that negligable enough, 1.54mm or could that difference cause some vibration at highway speeds still?
I may have a balancing issue.