It's pretty standard. BMWs have lug bolts, not lug nuts. So, when you remove them there are no bolts supporting the wheels. There is a small lip on the hub that will keep the wheel from just dropping off. Putting the wheels on is slightly more challenging, because you have to get the holes lined up accurately.
"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf." -- Geo. Orwell
Keep Right, Except to Pass
Than & Then usage - "It was hotter than hades (comparison). Then later on (time) it got cool."
2006 330i Sonora w/ ActiveAutoWerke flash tune - I like it!
2004 330i ZHP Imola/NB - missed
2000 328i TiAg - gone but not forgotten
BMW CCA member #388003 - www.bmwcca.org Use me as a referral, you could win a one day ///M Driving School!