Also, open up my spreadsheet.ll

It has the hub advantage of displaying ALL hubs in the database all at once in one long continuous page for "spokechart". Pop-in a theoretical 16 and 3 at the top - and a 612 for diameters.

Find a hub class/grouping where for the same flange diameters, you can see slight changes from 17 to 18 to 19 to 21.50...etc. I think you'll see your 10:1 ratio.

Then find a hub class/grouping where for the same flange diameters, you can see slight changes from 36 to 37 to 38 to 40 to 42...etc. I think you'll see roughly a 9:1 ratio.

Then do another experiement...for 38s, 40s, 42s, etc....find related offsets that are 2.6 - 3.0mm higher and 2.6 - 3.0mm lower. You'll see on average a 1.0mm difference in spoke length.

Then picture what a difference it makes if you suddenly decide to go all-elbows in or all-elbows out - especially if the spoke length offset reference was to the outside - and the wheel you are building is going to be elbows in...

Not too bad for 10mm and 12mm nipples - but can be a party spoiler for 14mm and 16mm nipples with restrictive threading.

=8-)