Originally Posted by
FBinNY
It's no different than with any spoke calculation.
Just verify 3 things and you're home free.
1. On hub, be sure to use a diameter at where the head pockets, so it matches the holes for J bend spokes.
2. Measure ERD including the nipples you plan to use. Deduct 1-2 mm ( per side) if you wish to spokes to end shy of the top.
3. Know your calculator. Some expect an ERD measured at the nipple seat and add 3-4mm for the nipple head. Others expect you to enter rhe ERD where you expect the spokes to end.
So, you might need to adjust the result according to the above 3 factors, but that's easy enough if you know what you're doing.
There is one more factor for straight pull which is spoke head offset. Usually a positive number which means it is added, but on rare occasions it can be a negative. The adjustment is made in the same way that half the spoke diameter is subtracted for J bend.
