I just bought a new Sram X.0 medium cage derailleur and I'm trying to install it properly. I'm a bit of a noob home-wrench, but I want to learn -- I've done most things besides build or true wheels. I understand the H and L adjustments, but I'm not quite sure about the B Tension adjustment. The instructions say 6mm between the 32t cog and the top der. cog, but I measured using a 6mm hex wrench, and it seemed to be too close.
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Thread: B Tension - how do I know?