Yet Another Cycling Forum
General Category => Freewheeling => Folders => Topic started by: LittleWheelsandBig on 25 February, 2023, 04:55:47 pm
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HK has been loaned a little-used Birdy Touring nearly two decades old. While tweaking it for multimodal touring, I finally got round to checking why the seatpost gradually drifts down and tends to twist. Half the clamping mechanism is missing!
This obsolete frame design has a square section penetration through the top tube and seat tube in front of the seat post. A pair of shaped plastic blocks are squeezed together by a long QR and those blocks clamp the seat post. There is no slot in the frame or any opportunity to fit a normal external seat clamp.
Birdy long ago changed their frame design to use a normal seat clamp and the obsolete seat clamps appear to be unobtanium after the usual searching.
It seems that bodging a replacement plastic block and assorted washers might be my only option. Any other suggestions?
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I have purchased some 28mm diameter Nylon rod that will be cut, drilled and filed to replace the missing bits but that will have to wait until I get back from Oz. The finished square-section blocks will be 22mm across the flats.
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Completed yesterday and hopefully being used for a multimodal trip next weekend.