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Done some googling, I think the un-dropped saddle height as max insertion is 10-20mm too high for the two bikes I've measured so far...
Full diagram inc overall length here: https://intl.9point8.ca/image/catalog/Products/Seatposts/Fall_Line/fall_line/Fall%20Line%20Sizing%20Diagram%20v1.pdfhttps://intl.9point8.ca/index.php?route=product/product&path=42&product_id=217
https://intl.9point8.ca/index.php?route=product/product&path=42&product_id=218Length x Stroke Lower Tube Length Min Insertion Height at Max Insertion Height at Min Insertion 325 x 75mm 190mm 90mm 135mm 235mm 350 x 100mm 190mm 90mm 160mm 260mm 375 x 125mm 190mm 90mm 185mm 285mm 415 x 125mm 230mm 100mm 185mm 315mm 440 x 150mm 230mm 110mm 210mm 330mm 500 x 175mm 264mm 145mm 236mm 355mm 560 x 200mm 300mm 180mm 260mm 380mm
Have an ad for it here...
175mm drop.
31.6mm diameter.
Has the thumb lever at 90° to the handlebar as below.
I just need to be able to replace it, (ideally with a Factory Transfer, secondhand though is fine) so I guess £250 is about right-ish?
@Dammit : I think the 175mm is going to be too long for me in this frame unfortunately, I suspect the dimensions are quite close to the Fall Line and I can't comfortably pedal with the seat post at max extension when inserted as far as possible into the frame. If it was a 150mm I'd be all over it!
I think I've decided I want a Stanton Slackline, the classic style with straight tubes and no fancy gusseting really appeals to me and the geometry ticks all of the right boxes!