asked by: a guest Will the 7803 39 tooth ring work as a replacement for the 7703 39 tooth ring?
A.
anwered by: canteau The 7803 is a 10-speed ring and the 7703 is a 9-speed chainring. Interchanging them would work poorly at best.
Shimano is also known for changing the chain ring profiles on each version of their cranks. You may not even be able to get the ring to bolt up properly.
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