Hi!

Thanks for quick replies. I have a Mavic A319 rims and Mavic recommends 12mm spokes (which I indeed have). Mavic also tells the ETRTO size: 622 x 19C and according to Rohloff manual spoke lenght in this case (32 holes) is 268mm if I use the cyclecycle.info -database.
Front I have Shimano DH-3N80 Dynamo hub (32 holes) and according to this site spocalc.htm from Sheldon Brown the spoke lenght in front wheel is 289,60mm.

Nevertheless, I have studied "Professional guide to wheel building" by Roger Musson and he said that you should not trust the data provided by the manufacturer but instead buy the hubs and rims first and then measure everything. After that use the formulas/calculators provided to find the adequate spoke lenghts.