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1. Prowheelbuilder.com, nds=288.6, ds=287.2

2. Dt Swiss, nds=288.6, ds=287.2

3. WheelPro(Musson site), nds= 288.4, ds=287

4. Bikeschool.com, nds=288.6, ds=287.2

My main question is about rounding the ds number, according to Musson you round up or down up to 1mm to the nearest number, there seems to be a consensus among the calculators, so the ds number is 287, do I need to round down to 286 or round up to 288?