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Is my Tiagra rear derailleur missing a screw?

Bicycles Asked on April 10, 2021

Just flipped my bike over, spotted this hole in the underside of my Tiagra derailleur. Looks like a screw should be in there, but there it is not. Should there be? Should I worry? What is this screw for/called?

If no, what purpose does this bike serve?

Note these are pics of the underside of the derailleur.

Tiagra rear derailleur 1
Tiagra rear derailleur 2

One Answer

I'm not sure if there are different Tiagra rear derailleurs, but if you look at the exploded view of the Tiagra RD-4700, I don't see any screws coming in from the underside (except for the bolt that clamps the cable), so I don't think you're missing anything.

Correct answer by Saaru Lindestøkke on April 10, 2021

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