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					Originally Posted by  my427cobra
					 
				 
				So what do the size designations mean? 
 
R6 (vintage 1960's) vs G6 (more modern) tread type? 
 
5.50 (section height)? 
 
9.75 (tread width)? 
 
Couldn't find info on Roger Krause website. 
 
Cheers 
Greg 
			
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 Info: 
http://rogerkrausracing.com/racetire...ra+2015cat.pdf
http://rogerkrausracing.com/racetire...+Race+2015.pdf
It looks to me that the 5.50 dimension is not directly related to section height, though it's a better match there than any other dimension. 
9.75 probably represents the section width, not the tread width. 
A current 6.00-15 G7 Blue Streak is listed as follows:
6.00-15: Diameter: 25.5"  SW/Rim: 10.6"/8.0"  Rim: 6.5"-10.0"  Tread Width: 8.4"