I am getting ready to build up a set of wheels and have calculated my spoke lengths.

For the front the length says 271.6 but the spokes I want only are available in 270 or 276. I am assuming i should round down the the 270.

On the back the length should be 281.6, and the spokes available are 280 or 282. Which one should i chose there?

For more info the rims are deep v's and the hubs are miche high flange track hubs fixed/free.

Thanks in advance.