Actually, I seem to remember that had something to do with the demise of "spinner" style hubcaps back in the late 60's or early 70's. Somebody claimed it did more damage to pedestrians.
Like MM said, there are bigger concerns.

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past MB rides:
'68 220D
'68 220D(another one)
'67 230
'84 SD
Current rides:
'06 Lexus RX330
'93 Ford F-250
'96 Corvette
'99 Polaris 700 RMK sled
2011 Polaris Assault
'86 Yamaha TT350(good 'ol thumper)