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@Smallfurry
The white ind double/double gives two qiute different ratios with the same chain length. Should be able to combine the crankset with a surly double fixed sprocket if you want double fixed. It might even be doable with two quite different fixed ratios on one side of the rear wheel and two singlespeed on the other. The crankset if aimed more at the off-road crowd though, so you'll end up with slightly spinny gears.
38 : 16 (SS) = 62.7 GI
35 : 19 (SS) = 48.6 GI
38 : 17 (F) = 59.0 GI
35 : 19 (F) = 48.6 GI