Originally Posted by
Al1943
It's amazing how often this question comes up.
Always round down, especially important for driveside rear spokes because the higher tension required to dish the wheel can cause you will run out of threads before reaching full tension. Double butted or skinny spokes often stretch magnifying the problem. I buy my driveside rear spokes at least 1 mm shorter than calculated.
Al
Since you buy your driveside spokes at least 1mm shorter than calculated. What about other spokes (non-driveside and front wheel)?