the 3055 28 x 10.5 that we use uses M5 compound, available with different sidewalls 3055 (std), 3055S (stiff ), and 3055W (wrinkle)
the 3055W due to the softer sidewall has a wider sidewall width 12.0" vs the 11.7" of the 3055/3055S
the 3055C uses L4 compound ( softest compound they make) and is meant for dragsters and lightwieght cars
im running the 3055 (stock frame and rolled fender lips, no air bags) which are a tight fit and only rub the frame when i make tight turns with a spool , probably more tire than i need . I'm considering going with 28x9" on the next set which come with the L8 compound ,
to read more on the differences in sidewall and compounds
http://www.mickeythompsontires.com/s...p?item=ETDrag#