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@kam
ok i found a accurate ish way if you have a seatpost already. Take a large rizla and wrap it around your seatpost and drop a line where the rizla overlaps. that's your circumference. measure that length really accurately and divide that by pie (or 3.142) and you get the diameter. ok so not necessarily mm perfect but i got a circumference of 85.5 mm which translates almost exactly as 27.2mm! Perfect for that campag chorus i have my eye on! mmm...