I have an old, 29lb Nishiki 10 speed. I am older, an analog guy, and frugal plus it fits me. I like it as a road bike which I will want to use for my first Sprint this summer and want to convert it back and forth to more of a Cyclocross or Hybrid to handle the manicured Katy Trail of Missouri. Is this possible? Is it advisable? If possible, what is the type and size tire could I get and is there a better handlebar? Thanks in advance for any thoughts. - TZ