What tread depth difference is acceptable?

[renau001]

Hi all, looking at the tread depth on all the tires of our new to us GX. Tires measure pretty evenly all around at 6/32". Spare measure at 9/32". Stock tread depth for the tire per tire rack is 10/32". So it appears that out of the 3 tire rotations the vehicle had, they only rotated the spare once.

So my question is is 3/32" or 2.5mm too much difference to go ahead and start rotating in the spare to even out wear? I'm concerned about uneven tire diameters and unnecessary wear on the driveline and differentials. Would appreciate your thoughts.

 

[TLar25]

I've always heard 2-3/32nd's is the limit. You could have the spare shaved down if it's too much of a difference and you just want to be able to use it without damaging the drivetrain

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