In case anyone is wondering, on a Sora 9-speed derailleur, you can fit a 42 tooth sprocket and a 11-42 cassette with no issues. Shown on a 2016 Trek Crossrip Elite. : r/gravelcycling
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File:Shimano Sora rear derailleur.jpg - Wikimedia Commons
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File:Shimano Sora Rear Derailleur.JPG - Wikimedia Commons
Shimano Sora rear derailleur install, U-ring on bolt - Bicycles Stack Exchange
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