Hi,
I just purchased a used Trek 850 Antelope at a yard sale. The bike seems to be in great condition and was a steal at $25 but I will probably be using mostly for just riding around town since I haven't been biking for about 18 years and have never tried offroading before. My question is are there any changes I should make to the bike to make it a better bike for local streets? I am thinking about replacing the tires, but don't know what would be best to replace them with. In addition, I really don't know where it compares with more modern bikes. What should I limit my spending to before it becomes more economical to buy new? Any advice would be greatly appreciated.

Thanks in advance,

Hoshyoto