Widest rear for PP wheels (19x9.5)

[ConspicuousConsumption]

I don't know much if anything about tire fitment, and tirerack.com isn't helping me much. How wide can you go on the 19x9.5" performance package rear wheels? I'm just curious if I can go larger than the stock 275x40.

Sorry if this is an already discussed topic. Did not find it.

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[ridenfish39]

I wouldn't go any wider than 285