Hi Greg,
There are certainly lots of advisory warnings out there asking people to have two spares. Here’s a sign I encountered as I began the Oodnadatta track last April that gave me a bit of a gut-check.
That was some pretty remote territory but with such a small vehicle we opted to carry one spare, plus a tyre repair kit.
We never did need to change a tyre, knock on wood!
As for your question about the smaller rim size, I’d say any spare is better than none at all, but I’d fix the original and rotate off that spare ASAP. Curious on the thoughts of others though!
Cheers,
Nick
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