cowboy, steel horse, etc
Join Date: Sep 2008
Location: Rock Springs, WY
Bikes: My War
Mentioned: 13 Post(s)
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What year is your 850??? I probably wouldn't upgrade much unless I got parts for free or almost free. Just replace parts if they break. Upgrade at that point when feasible.
But, if you're dying for new wheels, If your 850 has 7-speed cassette and if you get new wheels with 8-10 speed freehub body, you'll want to also get a 4.5mm spacer to drop on the freehub body before putting your old 7-speed cassette on.
There's an article on livestrong claiming that the 1997 Jetta Trek was basically an 850 frame, but parts were generally 930 spec (STX cranks instead of Alivio, for instance). Not sure how accurate that article is.
You can check specs of both those bikes at bikepedia.com, but I don't think they list the Jetta Trek specifically.