Join Date: Jun 2005
Location: South of Raleigh, North of New Hill, East of Harris Lake, NC
Bikes: Specialized Tarmac, Speialized Roubaix, Giant OCR-C, Specialized Stumpjumper FSR, Stumpjumper Comp, 88 & 92Nishiki Ariel, 01 Bianchi Campione, 87 Centurion Ironman, 92 Paramount
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You will not need a new wheel hub. You will need a new freehub to replace the 7speed freehub and you will have to re-dish the wheel to center it after adding the new freehub. You will need a new cassette (of course) and a new chain. Play it safe and check the spacing in your chainwheels to be sure they are spaced tight enough that a 9 speed chain will not slip between the chainwheels. I've been told with some crank/chainwheel set ups, it can happen that a 9 speed chain can slip between the chainwheels, but the 7 speed chainwheel spacing I've run into would not allow this to happen.
BUT before you make these changes, I'd check the stem of your bike to determine if you have a 1 1/8" headset or 1" headset. If it's 1", I don't think I'd invest a bunch of money in the bike because upgrading the fork is going to be a problem. If you're lucky enough to have a 1 1/8 inch headset, then have fun with the changes.
EDIT: I just realized, you might be changing to disc brakes. If you are, then yes, you will need to replace the entire hub, it might be cheaper to replace the entire wheel. If you're not changing the brakes then my original explanation stands.
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Last edited by roccobike; 08-22-08 at 08:41 PM.