Oz Bruiser wrote:I believe what the equivalent of a 31" is a 275 but not 100% on that and think it will fit in a Tyre diameter equivalent to a 31" Tyre. Again not positive on this, but if you if you got MR UCA's you may get a 285 on....
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As helmut already said, the rolling diameter is not only dependent on one parameter. The profile (ie 65) is a proportion of the width (ie 275). Hence a 275/65/17 is a smaller diameter than either of a 285/65/17 or a 275/70/17. Therefore... A 275 will only be a 31" diameter in a given profile.
Anyway, if it helps the original question - I have 265/70/17s (which are about 31.6") on my stock 2011 SR5 rims with a 2" lift and they don't rub whatsoever. In terms of width I have nearly an inch between the inner sidewalk and the upper control arm, so I would think you could go a 275 and maybe a 285 without hitting the UCA. When you deflate you tyres off road however... The sidewall will change shape and possibly rub, I haven't checked the clearance at lower than road pressures.
Legally - I have no idea, but you're not talking about much of an increase in size so I imagine you'll be fine.