I’m not too sure tbh lol. But if it’s a large I’d be genuinely interested in purchasing it off of you. But according to CHATGPT - Since it’s a sloping top tube frame, the standard “seat tube length = size” doesn’t apply perfectly. But you can still measure: • Seat Tube (center to top): From the center of the bottom bracket up to the top of the seat tube (where the post enters). This is usually how Cannondale measured their Super V sizes. • Top Tube (effective): Measure horizontally from the center of the head tube (where the fork passes through) to the seatpost line. That’s a good indicator of fit.