Update
What I've done is I've bought a local 'Minsk' 520 chain (non-ring, from an autofactor in Tynda) to act as my backup, put back on my old 14T front sprocket to give the chain an easier life and I'm now halfway to Yakutsk. Hopefully the original will last to Magadan but it is going to be really close. Seeing as it's only the 1st of August now and I'll probably be in Magadan in two weeks I have run out of time really - thanks for the replying to this thread! Much appreciated.
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