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  • If I want to check what the OLN is on a frame for a new back wheel, do I just measure the distance between the dropouts? I've no idea what the old (now defunct) wheel is.

  • How many gears did the old wheel have?

  • do I just measure the distance between the dropouts?

    Yeah, measure it, discover that it's halfway between two valid numbers, try to guess which way it's sprung 🤔

  • If I want to check what the OLN is on a frame for a new back wheel, do I just measure the distance between the dropouts?

    Yes.

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