Found I have a broken spoke. I see various resources for calculating spoke length but given this is a mass-produced item, isn't there some resource to look up exactly what spokes you need? What about just measuring the existing spokes? Where is the spoke length measured from? As I understand it, the spokes can be different lengths depending on which side and whether inner/outer.

For those whose response to everything is "take it to a bike shop", save yourself the keystrokes. Presumably this is a forum for those who want to learn about bike mechanics.