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0

Based on the picture there is nothing that prevents the pulley from spinning. It's worth the small amount of work needed to remove the pulley on the chance that it can be fixed before getting a new derailleur. Once removed from the cage look for dirt, bent parts or other obstructions. It may take a little experimenting to find the problem.


2

Looking at the derailleur, it looks like it got bumped up to something while riding and pushed it back. You could loosen it up the b-knucle bolt (circled in red, by someone else.) and that should help the derailleur go back to its normal position. But looking at other factors, both derailleur pulleys did their job. It is time for new derailleur, your ...


21

The derailleur is supposed to be mounted to the dropout at the hanger, circled in red here. It is not. It should have been mounted using a bracket that runs between the hanger and the part circled in blue, and that bracket clearly is not present. Also, something is pulling the parallelogram part of the derailleur, which is normally almost horizontal, so ...


12

Your rear derailleur has failed. Look closely and if it is floppy there's either a broken spring, or a lug has been torn off. To my eyes, the whole derailleur has become separated from the hanger in the photo ? The cable entry point is to the forward, which is something I've never seen, and implies it has all rotated. Bodging might work, but the safest ...


1

Ok, so I figured thigs out in the end. The culprit of the issues was incorrectly adjusted B-screw on the rear derailleur. Once I fixed the adjustment according to this famous Park Tool video about RD setup, the issue vanished. I needed to get the mech much closer to the cogs by moving it counter-clockwise by loosening the B-screw until the gap between the ...


3

Unless you're making a big jump up the price list, the quality of a rear mech makes very little difference to your ride, as long as the current one is working properly. The way the chain interacts with the rear cassette has a far greater impact. Those funny little waves on the side of the cogs in a higher spec cassette are there for a reason. Coupled with ...


0

Other possible reasons for under-performing shifting: The cassette is worn and needs replacing. Usually cassettes last three chains before a replacement is needed. Chainrings normally last two cassettes. After a chain replacement indexing is quite often in need for adjustment. As said in a comment, turning the barrel adjuster on the RD one or two clicks up ...


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Grx will compatible with 105 sfihter or tiagra... you will find compability with duraace or ultegra compability... on shimano website


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