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@Little_Jim
The exact inner diameter of the seat tube (measured with vernier callipers) is 25.4mm but I'm assuming I need a 25mm seat post. Not sure though as there seem to be a million and one different sizes. All I know is the post I've got is about 6 inches long and I need one at least twice that length, me being a 6 foot 4 inch lanky bastard. :)