well here is my 2c worth, I have owned a lot of bikes in my life, the tw is one of the best I have ever owned. Granted I have only had it a month or so but I love this bike. It is very easy to work on and there is a lot of parts and information on them. Keep in mind they are not fast or powerful but they will get you there and back. mine will run 55-60 no problem with me I am 5-11 170. I would not change the sprockets just ride it first and see how it works for you, are you going to trail ride? or lots of pavement? once you get a feel for it then decide. There is a lot if info on this forum that will help with any questions. I would not hesitate to ride my 87 tw anywhere. Just like any bike they all have there quirks.