I have a few questions about tubes. I have 700/30-32c tires on my Marin Sausalito. The tires are "Alterrainasaurus" and are an external tread thin hybrid style. When I bought the bike, the shop threw in a couple free tubes. The size of the tubes is 700/35. I went to a bike shop to buy other tubes. They offered to sell me some 700/28s which woudl fit my application. I declined because I feel like these people may be offering what is more convenient for them, but not ideal for my bike. I would like to eliminate flats, bent rims, etc as much as possible.
I'm curious what is the best size tube to use and what are the dis/advantages of using other sizes?
Also I figure 700 is the diameter in mm (rim/ID of tube?). 30 I'm guessing is the width in mm, correct? What is the second width # (followed by a c) ? Is the first one tread width and the second one sectional width? Which one woudl I use to choose a tube?
What is the best brand of tube to use, I would like to assure myself as few problems as possible and I don't mind spending a couple extra bucks for a good quality tube. Are some brands better than others?
Presta question - it looks like to fill the presta valve I need to unscrew the little thing at the top of it (the top of the valve, I'm not talking about the valve cap). How many turns is recommended?