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On this topic, is there a good rule of thumb for chain length related to the angles of the cage on your rear mech when in a certain ratio?
No, but there is a very simple set of proper instructions for setting chain length supplied with every retail boxed rear dérailleur, and if you've lost yours you can download it from the manufacturer's website. All the suggested rules of thumb based on cage angle are bullshit.
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As a rule of thumb I go big to big not through the derailleur, see where I could join the chain and add a link, remember how many links I could remove. Then go small to small through the derailleur and see what the fewest links I can remove while there is still tension on the chain, usually the cage is horizontal. Somewhere between the two will work, I err on the shorter side but a lot of the time it's the same length with both methods. If you use all the fancy maths and whatnot it tends to be the same.
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gbj_tester
snottyotter
@fizzy.bleach
On this topic, is there a good rule of thumb for chain length related to the angles of the cage on your rear mech when in a certain ratio? I'm sure I've seen something on that somewhere.