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frankenbike

Well I've definitely got a 90s MTB with 68mm BB shell...

Wikipedia says:

There are a few standard shell widths (68, 70, 73, 83 or 100 mm). Road bikes usually use 68 mm; Italian road bikes use 70 mm; Early model mountain bikes use 73 mm. Later models (1995 and newer) use 68 mm more commonly.

They reduced the shell width for MTB??? And then increased it back to 73mm again?

I don't know - might as well just measure it- there are all sorts of weird bikes out there

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