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I noticed in my E91 Owners Manual an optional tire size 225/40R18, yet it appears everyone opts for the staggered setup (225/40R18 front and 255/35R18 rear). Is there a disadvantage of having 225/40R18s at all four corners?
 

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I noticed in my E91 Owners Manual an optional tire size 225/40R18, yet it appears everyone opts for the staggered setup (225/40R18 front and 255/35R18 rear). Is there a disadvantage of having 225/40R18s at all four corners?
Everyone opts for the staggered setup because of looks. Having 225s all-around makes more sense from a handling standpoint -- less understeer, more neutral handling. Less cost, too.
 
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