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It's a pretty huge variance when you don't have a derailleur to keep tension
on the chain -- you have to run the chain slack enough in the right spot to
account for frame flex (side to side) but tight enough it doesn't rattle
around (falling off isn't an issue thanks to N/W).
When the ring is vertically it's most oblong vs. horizontally it's most oblong
it's relatively a big difference in the amount of chain it takes up
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