Parlee do a carbon derailleur clamp in 28.6 which might be what you're after -
price seems a little aggressive ...
The only thing reason I don't have one is the lead time bespoke quoted me to actually source one...
Exotic used to make one. I'll have another look
@fidbod started
London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
fidbod
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Parlee do a carbon derailleur clamp in 28.6 which might be what you're after -
price seems a little aggressive ...