If I have to run a different tire for about thirty miles on the right front,
how bad is that for the Syncro?

I've got myself in a situation where I don't have the proper spare (BFG off
road tire vs. regular spare tire), and am not able to get road servicer
(called Les Schwab, expensive plus they do not want to come out at 5:00pm
tonight).

Valve stem split; this is the second tire that this happened to so we will
replace the other two (and buy a proper spare).

Thanks for any advice.

Donna, 87 syncro