Couldn't find an answer to this, apologies if it's been covered - need to replace my rear derailleur which is a Tiagra 4600. Can I use the updated 4700 with the 4600 shifters or this that literally mental?
No.
Put any Shimano derailleur and you'll be fine, 5600, Sora, etc.
Looks like alomost any 10 speed RD except a 4700 RD which only seems to be compatible with 4700 shifters from the Shimano charts
@edscoble started
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Couldn't find an answer to this, apologies if it's been covered - need to replace my rear derailleur which is a Tiagra 4600. Can I use the updated 4700 with the 4600 shifters or this that literally mental?