A 23t chainring will run the chain at a 2mm smaller radius than a 24t chainring. I looked at the 24t chainring I have on a Sugino XD, and the chain already runs so close to the mounting posts on the crank that the chainring bolts to that a 23t chainring wouldn't work as the chain would actually hit the mounting posts. You would have to file down the outside of each post to provide more clearance.
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