Here are a couple of bike tire size charts, from the early / mid Seventies, before the ISO sizing system came into widespread use. Scroll down for a Raleigh spoke & rim chart.
       
 
       

 Below is a tire size chart, from Raleigh dealer literature, mid Seventies
       
 
       

 And here is a rim &spoke length chart, from Raleigh dealer literature, mid Seventies.
 
 
         Also see this Hercules hub brochure
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     Also see this Sachs Jet Coaster Hub Illustration