Bike maintenance
Hello,
I'm new to bike related things, and I've been riding a MTB for a few years now, it's a some model of Giant, not sure which one, it is for sure about 12 years old, maybe even older, but it rides fine and I really like it, the question is, what should I replace so that I can ensure my own safety and joy? It has bullhorn handlebars and twisting shifting system, it is indeed very uncomfortable, is it possible to change that?