well they do help with traction, for example my car has 155/70/12\s on it at the moment,
I can get my car slideways very easily (if i want to but i'm a safe driver most the time)
with 175/70/13's i cant get my car sideways no matter how hard i try, i cannot do "skids" and no matter how hard i take a corner the dam things wont lose traction unlike the smaller tyres, so they do help, but i assume that it does get to a point where the difference becomes minimal
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