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This is a speed comparison video of RD-9100 and RD-5800.
You can see that there is a difference in chain movement and accuracy during gear shifting.
st385xys.com Please also take a look.
Parts configuration
Previous: RD-9100 DURA-ACE, CS-R8000 (11-28T), CN-HG901
Rear: RD-5800 105, CS-5800 (11-28T), CN-HG601