@MLE_online If the hub an is AW, you can use the spec sheet from Sturmey Archer's website. The AW you can buy new today is dimensionally identical where it matters to one from from immediately after WWII.
@dragonfrog that still doesn't tell me the length of spokes I need because sturmey Archer doesn't know what size my rim is, and neither do I until I disassemble it
Oh I had missed that your rim was also in a wheel currently in use.
You can do it without fully disassembling the wheel - though you do have to take the tire and rim tape off so it's still a bit of a faff.
This video from the 5:20 mark does a good job of showing the method. He calculates the outside diameter by measuring the radius - usually you can get away with just adding 10 mm to the ERTRO bead seat diameter.
@MLE_online to prove it, take a few measurements with an estimated error. now put those numbers into the calculators. you’ll get maybe a 1mm spoke difference at most.
@MLE_online
So, it's a different rim diameter, right? Trying to make sure I understand why you can't measure the existing spokes. (Especially whether there's a reason that wouldn't be sufficient even if it were the same rim.)
@FeralRobots Yes, it's a different rim diameter. The Sturmey Archer hub is coming off a rim built to an obsolete British standard and going onto a rim from a 1980s Japanese road bike.
@FeralRobots it is arcana though. Even when you have the nominal measurement of a wheel, there's nothing to tell you what size it actually is. It just tells you the nominal size of the tire that fits it, and those nominal tire sizes also don't really mean anything other than that they fit a certain size of rim
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