Generally 2x the tube thickness, you could probably get away with 1.8x on a gravel bike but for MTB 2x or slightly more is good.
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Ah thats my bad with poor word choice. When I said “join area”, I meant my join area and not the end of the tubes. I’m doing 420mm chainstay + ~20mm join length which puts the internal lug into the region where it starts to become oval
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Ah thanks! Ok, I’ll probably be more conservative and start with 2x even though its an all road bike
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For reference only, not saying what you should do, I use 1.2mm on my swing arm yokes, with an 1.0mm thick rib horizontal throughout the whole structure.
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