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is there a narrower band on adapter than 31.8mm?
28.6mm is the next size down, to suit most old-school steel seat tubes. There's a cheap aluminium one which comes with lots of different names on the packaging but they all seem to be the same (so support a fellow forumenger), or a #buyer Parlee carbon fibre one.
KCNC do a slightly nicer than generic one in pretty colours https://www.bike24.com/p229310.html
is there a narrower band on adapter than 31.8mm?