wasnt clear on that-not opposite effect- piz showed a 180 to 190 on a 5.5 rim, o.p. asked about goin 190 to 180 on a 6inch rim. thats what i meant.
as far as actual effect i have no clue- i always thought if i put a 180 on a 6in rim, it would have more straightline contact patch, and if you squeezed a 190 on a 5.5in rim, you would have less straightline contact, and more contact when leaned over. pizdets pic seems to show the opposite
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