I know these threads come up all the time, but I am hoping to get a little help and confirmation before I buy some parts.
I am doing my first build and I'll be using Kinlin XR-300 rims laced to an Ultegra 6600 rear hub and an XT M756 front disc hub. 32 spokes each, 3x.
I don't have any of the parts on hand yet, but the measurements are available from a wide variety of sources and all give the same values.
Front hub gives me a center to flange of 21.1 on the left, and 31.7 on the right with a 61mm flange diameter. Rear hub is 38.4 on the right and 20.8 left, with a diameter of 45mm.
Using two different calculators and an ERD of 577, I get:
Front - 277.8 L and 278.8 R
Rear - 282 L and 280.1 R
So I'm thinking I will order 278mm spokes for the front wheel with 282 and 280 for the rear. In all the reading I've been doing, I keep seeing to round down on spoke lengths, so is the 278 going to give me a problem for the left side of the front wheel? One source for the spokes sells in even numbers only, but is the cheapest I've seen, so that's why I'm apprehensive.
I'll be doing much more reading before I start the build, but I'd like to have all the parts here before I do that, so any advice is greatly appreciated.