Jay,  Thanks for the attached.  Do you happen to know if these sorts of figures
are for loaded or unloaded tires?  Seems like loaded radials could lose
somewhere around 4mm on the effective radius (8mm of diameter) to the buldge
above the footprint.   The bias-ply tires don't appear to give as much. 
This could be sort of like measuring diameter of the tire in the trunk rather
than the effective diameter of the tires on the road.  Just curious. 
    
>  Size  Diameter  Width (mm)
>  
>  5.60-13   600  145   - std on Series I & II  (Rims 4J and 4.5J)
>  5.90-13   616  150   - opt on all Series     (Rims 4J and 4.5J)
>  6.00-13   600  156   - std on Series III - V (Rims 4.5J and 5J)
>  
>  155 R 13  578  157   (reported as too low)
>  165 R 13  596  167
>  175 R 13  608  178   (reported as too high)
>  185 R 13  624  188
>  
>  195/70 R13  608  197
>  205/70 R13  625  204
>  175/70 R14  606  176
>  185/70 R14  624  186
>  
Regards,
Bob Douglas
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