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Technical FAQ: Dura-Ace 7900 crankset with 9-speed drivetrain.

Dear Lennard,
I am setting up a new ’cross bike and would like to use a 7900 Dura Ace crankset with a Dura Ace 9-speed drivetrain. Will this work? If not can chainring spacers help? What size would I need?
-Rick

Dear Rick,
I haven’t tried that combo. Sorry. But why would you want 39-53 chainrings on a ’cross bike?
Lennard