You can get converters for those, I was able to find one for an oversized (not BMX!) BB shell on my old Swedish Crescent. Mine was from here: http://www.pyoratohtori.fi/index.html
Oh. Huh. How did you work out what you needed? Measure the BB width?
BB or BB shell? For the BB it was down to whatever chainline was required.
@Belagerent started 3 years ago
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You can get converters for those, I was able to find one for an oversized (not BMX!) BB shell on my old Swedish Crescent. Mine was from here:
http://www.pyoratohtori.fi/index.html