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@O'Shane
With a 360mm chainstay length you can get a 1.9" tyre in there. If the frame has a larger diameter seat tube you may be limited to 1.75" which is still big enough. I think the hardest bit with short chainstay lengths is keeping the strengths in the chainstay while still having space for the tyre and the chainrings. I believe this is why a 73mm BB was used on Emyr's BTR.