If you are using the CR-18 rims in the 590 the spokes are an even swap with the original sized ones.
If you go with a different sized rim you will need to do some calculating. I just ordered 4 of the CR-18's for my Superbe and my wife's Colt. I am actually lacing up spare hubs, haven't figured out the spoke sizes for her bike yet. But mine will be the same as what is on there now. I am actually upgrading from the AW to an FW hub on the Superbe
I use a couple of different spoke calculators
SpokeCalc is one then one from
Bike School I measure my own hubs and rims...
Aaron