Deep / Flat fuchs
 

I have searched honest . . .

Someone has told me there is a difference between the way these two rims mount to the hub (something like . . . one centres itself and the other doesn't). Anyone know more (apologies if this is a dumb question)?

He said I could tell simply by looking closely at their rears (but I've only got deeps and can't find detailed enough photos).

Cheers
Phil