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@noiser
http://www.jejamescycles.co.uk/product-images-large/look-frame-seat-post-bolt-kg-451-361-381-481-39071.jpg
Do the 451 361 381 481 all have the same seatpost clamp mechanism?
Will the above clamp a 25mm post in a 231 frame?
Have the above and I'm dubious...