| Paul,
   How can effective circ differ from actual?   I can see that diameter
can be effective  or   actual because of squish, but do not understand
how circumference is affected.  
   x inches of road progress is made by x inches of rubber, isn't it?   
Seems to me that the wheel moves same distance on the pavement that is
represented by a string wrapped around the wheel.
   Is there another factor that I am missing?
Bob
On Fri, 3 Jun 2005 09:50:36 +0100 "Paul Hunt"
<paul.hunt1@blueyonder.co.uk> writes:
> The *effective* circumference is governed by the radius at the point 
> of contact with the road.  The *actual* circumference is immaterial.
> 
> PaulH.
 |