From: herro001@umn.edu   
      
   The wheels have a pattern in one spot that was machined into the wheel   
   give them a place to attach to the lander during cruise and landing.   
      
   In article ,   
    Peter Trei  wrote:   
      
   > Looking at the Mars Rover tracks, I notice that at   
   > regular intervals a few feet apart, the treadmarks   
   > left in the dust are disturbed for a few inches before   
   > continuing again.   
   >   
   > Are the treads different at one point in their   
   > circumference? Is the rover skidding to a halt   
   > every few feet?   
   >   
   > Incquiring minds want to know....   
   >   
   > See:   
   > http://photojournal.jpl.nasa.gov/jpeg/PIA05291.jpg   
   >   
   > Peter Trei   
   >   
      
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