C-Record era Chorus take a 111mm BB for a 42mm chainline; '95 onwards (says Chorus on the crank arm) take a 102mm BB.
Assuming it's the latter, you should be ok with your current BB if you put the chain ring inboard.
@Scilly.Suffolk started
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C-Record era Chorus take a 111mm BB for a 42mm chainline; '95 onwards (says Chorus on the crank arm) take a 102mm BB.
Assuming it's the latter, you should be ok with your current BB if you put the chain ring inboard.