5 tire, every 5k.
If you leave the 5th as a spare and never rotate it in, it will end up being notably different tread depth if it ever needs to be put in service. Sure, it doesn't make much difference as with some vehicles but I find it to be good practice to keep them wearing fairly equally. Eventually that spare will need to be discarded due to age anyways, so I would rather utilize it and potentially use the tires longer as a whole.
If you leave the 5th as a spare and never rotate it in, it will end up being notably different tread depth if it ever needs to be put in service. Sure, it doesn't make much difference as with some vehicles but I find it to be good practice to keep them wearing fairly equally. Eventually that spare will need to be discarded due to age anyways, so I would rather utilize it and potentially use the tires longer as a whole.
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