That said as a framebuilder who used to subsist on doing a lot of repairs on steel frames i have dealt with seat tubes that were cracked at the front derailleur braze on.
Clamp on front derailleur carbon frame.
Show me your green.
Sizes available are 28 6mm 31 8mm and 34 9mm.
All parlee frame sets use 34 9mm clamps.
Traditional steel alloy front derailleur clamps look clumsy and weigh a lot more than what they need to.
Easiest option is the clamp you could use a copper pipe or similar to maintain the structural integrity of the carbon tube to avoid over tightening it of the right diameter.
On carbon frames tube spec generally seem to run big rather than small once you figure in the clearcoat.
Our front derailleur clamp have been designed particularly with the weight conscious rider in mind.
You could measure the tube with a caliper to see if it is 34 9 or a hair larger.
Our renowned carbon front derailleur mount is now available for all frame sets not just our own.
Our 1 piece carbon construction cuts material to an absolute minimum with a very simple understated design.
Unique 1 bolt carbon design won t dent or scratch frames.
A torque key and patience are required for that.
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Fiber grip or a similar assembly compound helps increase grip under lower torque but this does nothing to prevent you from over tightening the bolt and crimping the tube.
There s no need to treat the underlying carbon before installing a clamp on front derailer.
The clamp has no moving parts or pivots that can damage lightweight carbon fiber titanium or aluminum seat tubes.