The description for 30038 is incorrect: 
should be 
The nomenclature is meant to follow the ISO standard for real vehicle tyres, as closely as possible. Although not explicitly stated here the intention was to allow for a 3-digit profile percentage and a 2-digit width. The ISO standard does not have white space around the "/". The inclusion of spaces around the "x" was arbitrary, and in the ISO standard would be B (bias belt), D (diagonal) or R (radial) without spaces. Since LEGO tyres don't have such internal construction, x (or X) is a good substitute.
However in the nomenclature explanation
is easier to read than
but upper casing the "X" would help:
I am happy to make the title changes if the majority view is to remove the spaces.
	
	
Code:
Tyre 8/ 40 x 8 Slick SmoothCode:
Tyre  8/ 40 x  8 Slick SmoothThe nomenclature is meant to follow the ISO standard for real vehicle tyres, as closely as possible. Although not explicitly stated here the intention was to allow for a 3-digit profile percentage and a 2-digit width. The ISO standard does not have white space around the "/". The inclusion of spaces around the "x" was arbitrary, and in the ISO standard would be B (bias belt), D (diagonal) or R (radial) without spaces. Since LEGO tyres don't have such internal construction, x (or X) is a good substitute.
However in the nomenclature explanation
Code:
width_(mm)/profile_as_%age_of_width x rim_diameter_(mm)Code:
width_(mm)/profile_as_%age_of_widthxrim_diameter_(mm)Code:
width_(mm)/profile_as_%age_of_widthXrim_diameter_(mm)I am happy to make the title changes if the majority view is to remove the spaces.
Chris (LDraw Parts Library Admin)
	
	
      
      
 