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  • Unfortunately I don't have a chain hook. Why do you think I should make the chain shorter? Commented Sep 8, 2023 at 11:08
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    Why you should make it shorter: In your photos in the big-big combination it looks like your derailleur still allows a good amount of movement and in the small-small combination there is very little (too little) tension. I think you can even see that the chain is sagging slightly. Commented Sep 8, 2023 at 12:12
  • You were wrong mate. Please check new photos. Commented Sep 9, 2023 at 8:43
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    This answer isn't wrong. The new chain length is fine as well. Yes, the derailleur is extended quite a bit to the front in the big-big combination, but neither the derailleur nor any other part is in danger of being damaged, and one shouldn't use the big-big combination anyway (it's inefficient and bad for the chain). There are pros and cons to shortening the chain. Michael's and Criggie's answers are both reasonable. Commented Sep 11, 2023 at 14:15