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@gbj_tester
Not really tandem related, but the CentreLock hub interface will work with sprockets down to 12T. 1R8 chain will hit the lock ring or hub shell, but KMC X101 will fit in the gap. Chainline 35.5mm (40.5mm with a Boost110 hub) with the hub in its normal position, but most hubs benefit from a shift to the right to place the rim half way between the flanges, so 40-42mm should work out nicely.
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