Find the rim on tartybikes, take note of the rim ERD. Then find the hub and note the dimensions given for the flange diameters and spacing. Go on the DT Swiss website, use their spoke calculator with the dimensions you've noted and SHAZAM! you'll have your spoke lengths. I'd do it for you, but you might as well learn how to use the calculator for future use.
If you want us to check your results, take a screen shot of the calculator once you've filled it all out and post it up here.