Good day All. The name is Max Roach and I am from Cape Town. I am a potential newbie to the sport of mountain biking. When I say potential, I mean I am yet to purchase a bike and all necessary equipment. The reason is that I have come to understand the importance in purchasing the right size bike and as such I would really like assistance in making an informed decision. I am 1.76m in height with an inleg of around 78cm and weigh 80kg. Based on my research, I presumably need a 17" to 18" frame which is supposedly a medium but in my search for a second hand bike, all the numbers make reference to 24" and up. Is that wheel size or frame size? I am hoping more experienced mountain bikers would be able to assist me in making the correct decision. I am really itching to get started and I do not want to make hasty decisions. Like they say...prevention is better than cure.