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Thanks for the interest. I've had it since new. Stock 54cm geo.
That is 54cm x 54cm i.e. top tube measured horizontally centre to centre and seat tube centre of BB to centre of the seat tube. The head tube measures 130mm excluding the headset and measured from the fork crown to the top of the headset is 155mm. The seat tube measured centre of the BB to the top of the Serotta branded seat post clamp is 56.5cm.
The BB is English threaded so takes outboard cups. A big thumbs up for me vs press fit. If you have any other questions please let me know. Ta.
Is the Serotta custom geometry and have you had it since new? It’s very tempting...
And is there a head tube measurement?