Had to bump this thread cause my road bike is supposed to be coming in today. Found an insanely good deal on Trek Madone on Ebay. Never thought I'd be able to afford Carbon Fiber bike. I'm stoked.
I imagine she won't want to do any hardcore biking. But we do stay in the smokies and in places that have some decent trails.
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If your only going to ride on forest roads or easy trails than a decent entry level mountain bike should work. You can buy one new for $800-1000 or on Ebay/Craigslist for half that. The best thing to do is go to a couple of local bike shops. They will let you test ride different models. You will be able to the difference in cost and brand. Figure out which one you like then look online. If your patient you can find one that is only slightly used. Somebody bought it trying out the sport or for a wife/girlfriend and only rode it a couple of times. I did that for my wife who's a casual rider. Her bike new was $700. I got it off Craigslist for $250. Mtbr.com is good review site also. Hope this helps.