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you need to tell us the SIZES of each tire... if they're different brands but the same size, they should be ALMOST OK... if the two rears are the same and two fronts are the same, you shouldn't be having problems.
I don't know what bumps are on tires, though, I haven't experienced that...
That said, tires are your most important mod... I suggest getting them replaced with quality (read: sticky) pieces.
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