Join Date: Jun 2011
Location: Sunnyvale, California
Bikes: Bridgestone RB-1, 600, T700, MB-6 w/ Dirt Drops, MB-Zip, Bianchi Limited, Nashbar Hounder
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If you check Sheldon Brown's site, he has a link to a spreadsheet, spocalc.xls that has 3 tables, one of them for hubs. There should be a reference to some 600 Ultegra Hubs, maybe from previous generations. But you'll see that most modern Shimano freehubs have 45mm diam. separation on holes, and 37 - 38 left flange spacing from center, and 20 - 24mm right flange spacing from center. And if you get the same number of holes, you may notice that even starting from Acera and Altus, and even with the MTB hubs, the flange size and spacings are really similar to each other. So if you selected spokes that aren't too long or too short for your original build, then it's very likely, those lower end hubs are likely to work fine.