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yeah, 54-55. also depends on your rear tire size. 22x10x9 is factory and mine had 20x10x9 when it went 55. if you run the factory 22 then you may see 58-60
my 250x only ran 52mph, that was when it was bone stock, it now has a cobra system, jets, and vito air filter. it does 57mph now, or so a trail tech speedo tells me.