By hub adapter do you mean for mounting the drive sprocket on wheel?
If so, you need a custom adapter and the measurements for your hub. To get measurements you need a micrometer or a dial caliper.
I ordered one for a wheel that came with my 7-speed Schwinn Alloy Seven, it was 1.300".
Bought it from here: CUSTOM ADAPTERS and got it real quick for $45. You also need a compatible sprocket for it.
THANKEE FROM AN ORANGE COUNTY HOMEBREWER
http://pic20.picturetrail.com/VOL1229/6309647/12253703/179641941.jpg