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Old 07-10-15, 07:48 PM
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I have had this problem over the years with various bikes. Manufacturers do lots of shaping and styling. You end up with a round cross section seat post and an oval-shaped seat tube without sufficient clamping area. I have used different clamps as described above but what also works well is a small shim fashioned out of an aluminum soda can. Cut a small shim with scissors. Just be careful not to cut yourself.
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