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TotalShanner
Current S3 only needs 65mm in the frame 🤷75mm in and 218mm out is within the 3:1 rule of thumb you use in the absence of better info, although the out dimension is more like 260 when you include the head. 75mm probably gets you below the bottom of the top tube, which is another gotcha with frames where the junction is not at the top of the seat tube