Vernon Barker 531 tandem - rescue from the woods

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Simba

You don’t need to go 1/8 on the synch drive.

If you are lucky those chainsets are 110 bcd, and you can use any inner from a compact chainset, they’ll only be 34t but they’ll be really cheap.
Pair it with an 8s KMC chain and you’ll have a cheap and strong setup for the synch drive

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Ndeipi in reply to @Simba

That's a tip and a half. Thanks!
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Ndeipi in reply to @Simba

I just measured the synch chainrings, they are 55 mm between adjacent hole centres. So 94 mm BCD compact triple size. Slightly harder to find than the 110BCD rings, but doable. I've so far found TA 9-10 spd rings for £23/each, so not a total disaster.

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