with a 44T ring?
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The difference in diameter is miniscule between a 42T and a 44T ring.
In my experience f derailleurs are pretty universal and able to shift ring combinations that they weren't designed to.
I regularly run road double f derailleurs with mtb cranksets and also haven't had any problems using an XTR f derailleur designed for 46/48T rings on a 53T road ring.
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