Join Date: May 2004
Location: Wilmington, DE
Bikes: 1984 Trek 660, 2003 Specialized Hardrock, 2004 LOOK KG386i, 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1, 2014 Islabikes CNOC 14 (son's)
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I'll begin by saying that if your goal is an upright positioned road bike, I'd highly suggest simply buying that bike rather than trying to transform a bike built for an entirely different purpose into a road bike. While you can end up with something that looks like a road bike in the end, the geometry of the bike may leave a lot to be desired, you'll have spent a considerable amount of money getting there, and you'll have dismantled a perfectly good bike to get there.
So with that said, I'll attempt to answer your questions.
First, your current fork is a threaded fork, apparently 1 1/8" in diameter. It is also a suspension fork and your frame is designed around that. While you could install a 1 1/8" threadless road fork doing so would require a new headset and a new stem and the result would be a much lower front end to your bike. The issue is the axle to crown distance of your current fork and a road fork. They are going to be quite different with road forks generally around 370mm. In order to find out how much difference there would be, you'll need to figure out your current axle to crown height, probably in the 430-450mm range (measure with someone sitting on the bike to account for fork sag).
Once you have that dimension, you can begin searching for a suspension corrected fork for your bike. A quick search turned up this option which will likely only impart a slight geometry change but it isn't carbon fiber: http://www.bikepartsexpress.com/mm5/...content=FK0086
It's also threadless which means you are still going to need a new headset and stem. If you really wanted carbon fiber you are likely out of luck unless you want to vastly change your geometry. There are carbon fiber cross forks with axle to crown lengths slightly under 400mm or 29er rigid carbon fibers at ~470mm. I personally wouldn't use either.
Good luck trying to find a 1 1/8" threaded 700c suspension-corrected fork. 1 1/8" threaded is the least common of any fork design. It's tough enough to find 1" threaded forks these days.
Hope this helps.