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I cut just under a cm from the mast. The factory centre BB to top of seat mast was B1 on the chart above (81cm). You'd have added a further 7-8cm to that for saddle clamp and saddle height.
At the moment it's 80cm, then add 7-8cm to that for saddle clamp and saddle height.
You can see from the lines at the top of the seatmast (spaced at 0.5cm) how much the clamp can add (with the use of the Ridley Spacers) if needed.
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Out if interest, how long is the seat tube CT? Asking as although this is too short for me, wondered what the saddle height would have been before the haircut. Thanks