I saw someone post some info on this a while ago, although I cant really remember what thread is was and search doesn't pull anything up.

I currently have a Trek xcalibur 4 which is a 19.5" frame and 29" wheels. The wheels are standard MTB knobbly type and really not what I need. I wanted to try get a road bike, but the stores around here only stock either MTB in Chinese man sizes (too small) or bitch bikes and it was a real task just to find a store that sold man sized bikes, let alone having the choice of what style of bike.

Anyway, I wanna buy some more street tuned tires, although finding any in China is hard, I am sure I can manage it with persistence. My question is, firstly should I go for 'slick' type tyres or is there a middle ground? I spend 90% of my time on roads.

Second, does the width matter? I think I am currently rocking 2" of width.

Third, do I need to buy new inner tubes for the new tires?