For the way this has been done, yes this is how you edit what tires are equipped, but you do not keep these tires unless you change a range of bytes, If everyone wants the list of tires here they are:
Comfort Hard
Comfort Medium
Comfort Soft
Sports Hard
Sports Medium
Sports Soft
Sports SuperSoft
Racing Hard
Racing Medium
Racing Soft
Racing SuperSoft
Racing Intermediate
Racing Rain
Dirt
Snow
Comfort Hard (C)
Comfort Medium (C)
Comfort Soft (C)
Sports Hard (C)
Sports Medium (C)
Sports Soft (C)
Sports SuperSoft (C)
Racing Hard (C)
Racing Medium (C)
Racing Soft (C)
Racing SuperSoft (C)
Racing Intermediate (C)
Racing Rain (C)
Dirt (C)
Snow (C)
Comfort Hard (V)
Comfort Medium (V)
Comfort Soft (V)
Sports Hard (V)
Sports Medium (V)
Sports Soft (V)
Sports SuperSoft (V)
Racing Hard (V)
Racing Medium (V)
Racing Soft (V)
Racing SuperSoft (V)
Racing Intermediate (V)
Racing Heavy Rain (V)
Dirt (V)
Snow (V)
The V stands for Velocity (increased grip off the line for drag racing) and the C stands for cornering (better traction in the corners), but as far as I have worked out, ther is 0 difference between the RSS, RSS (C) and the RSS (V).
Edit: Screw it:
This is what you need to change:
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