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If I remember right the disc mount face is 46 mm from the centreline of the hub, so the chainline works out to be 47-48 mm depending on cog width. Close enough to the middle ring position on a MTB chainset, or you could space it out to approx 53 mm to get to the outer ring. You could move the BB spacers around to tweak chainline too if you've got clearance for the ring.
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Old post but I've done something similar and ended up using the outer position on a triple. I can't remember the numbers but the chainline was quite wide, over 50mm I think. I can measure it tomorrow if you like. Fair warning: haven't ridden the bike in anger as I've been away over Christmas so the chain could well end up grinding or popping off or something; who knows.
If you decide to buy a cog the cheapest one I found was this from Triton
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hiraethus
frankenbike
@umop3pisdn
So I've got an EBB mtb with vertical dropouts and a spare 6-bolt rear wheel.
Is the chainline from a flipped rear wheel gonna be close enough to a chainring in the outer position on a HT2 mtb crankset to have some 6-bolt off-road fixed fun? Quick Google looks promising...
Anyone got a 16t ISO bolt on cog unwanted?