Hello everyone. I rode my bike a ton when I was a kid, but when I turned 16 it was thrown to the curb. I now would like to get back into biking. I just turned 40 and I am in good shape (5'10", 155#), I work out on a regular basis. I still have a Giant Sedona mountain bike from 1991 that I occasionally ride around. I plan on riding on bike trails: paved, gravel and dirt. In fact, I am going to ride the 400 and Elroy-Sparta trails next weekend.

I have several questions. First, do I need a new bike or is my 1991 Giant Sedona adequate? Second, I have been struggling with the fit of the bike. I realized, after reading a blog, that after all of these years of riding the Giant, that the seat had been set too low and that perhaps the seat was also too forward? I read several blogs and am having a difficult time getting the fit correct. With the pedals at 6/12, My knee is slightly bent, but when I do the elbow to stem test, my finger only reaches the bottom of the stem. Additionally, I believe that my knees are over the center of the pedal (recently had knee surgery). Somehow though, I find my self constantly changing my grip so that I am holding the bar with my fingertips, which leads me to believe that my seat is too far back or that my bar is too low? I just can't figure it out.

Thank you in advance for the advice.