Tandems of the forum

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gbj_tester in reply to @Skülly

what’s the wisdom of making these have generally small chainrings?

There's no wisdom, just tradition and a desire to save a little money and weight. The primary drive rings, whether crossover or straight through, take no more load than those on a solo.

The limit is going to be chainstay clearance, up to that point going bigger is a good thing for smoother drive and slower wear.

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Skülly in reply to @gbj_tester

Thanks. Of course, stays clearance is something to bear in mind, I was excited to see some 52s in the obselete PCD of the cranks I have, but needing a mahoosive BB spindle and large Q factor for the stoker is probably worth avoiding.

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gbj_tester in reply to @Skülly

needing a mahoosive BB spindle and large Q factor

In a symmetrical set up, there should be no effect on spindle length and Q from using primary drive rings the same size as your largest final drive ring.

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