Join Date: May 2010
Location: Madison, Wisconsin
Mentioned: 2 Post(s)
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Suntour freehubs and the cassettes that go with them are orphans, long since discontinued when Suntour was bought out by SR. You have two choices:
1. Find a Suntour cassette, possibly from a donor bike or pay through the nose on ebay.
2. Rebuild the wheel with a Shimano Freehub hub, hopefully the dimensions will be the same so you can re-use the spokes. This is the only "sustainable" option because Suntour cassettes were only made for a couple years and are now virtually extinct. I won't even buy a used bike with Suntour indexed components for this reason, unless I'm only after the frame and can get a serious discount.
Next time figure out your drivetrain before building your wheels is all I can say, sorry dude.