Okay, I realise that this is completely trivial, but I’d like to know nonetheless…
Why do the hubcaps on trucks/buses tend to stick out on the front wheels but stick in on the rear wheels?
Sorry, I have just seen that this was answered before:
http://boards.straightdope.com/sdmb/showthread.php?threadid=56618
Damn, and I was all fired up for a good belly button thread. 