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@ough
Now my issue is with the chainline. It's so far off, and I'm struggling to see how to get it straight. The rear spacing is 124mm, and the current hub is 115mm so that needs changing.
The bottom bracket shell is 68mm wide, and at the moment a straight line from the cog position gives me this:
It's way in the bottom bracket, not even close to clearing it. Assuming I change the rear hub, I'm still unsure if it will eventually fit. Here's a clearer line:
Measuring the bolts and threads for cog and lock ring, I get around 24mm of bits on each side, then the hub. Putting that on a scheme against the bottom bracket, I still have a projected 7mm offset on the best of cases:
Somehow 124mm spacing and 68mm bb shell doesn't seem like unusual measurements, so surely there's a dead simple way out of this. I want to avoid buying parts for trial and error, anyone with similar specs that can shed some light?