• As per the title, i'm after a 10 speed shimano cassette, must have a 16 tooth cog, so either a 12-27 or 11-23 will do, i have both compact and standard rings so can get the ratios i want with either set up. preferably after an ultegra or 105 but could stretch to dura ace if the price is right. please send a pm if you've got anything, cheers in advance.

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