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Can i use the xx front derailleur for 39/26 chainrings also with frm 40/27 chainrings? Or do i need the FD for 42/28? Thank you.
 

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You need the FD for 42/28. I can't remember where I read it though. I'll have a look and see where I found it but I'm looking to do a similar thing.
 

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does your frame use the direct mount front derailleur or the normal clamp on front derailleur? if clamp on, there is no specific 26/39, 28/42. there are only different ones in the direct mount derailleurs to get them at the right height for the chainrings.
 
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