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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.
gbj_tester
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.