I'm partially disabled and can't/don't drive so I have to have a bike to get around in order to have any kind of independence so I can go out to do local shopping if I need to without having to arrange for a ride.

I have a Schwinn three wheeler like this
http://www.walmart.com/ip/Schwinn-Me...icycle/5679542

which I got from WalMart, had to walk up there to get it after they assembled it.

At first it was very good and I was able to go and get groceries and it holds about five or six bags of groceries.

However, I soon got a flat. I don't know much about bikes and didn't know how come the tire went flat when I tried pumping air into it. I got one hand (my other hand is almost totally disabled) and so it was hard to use the bike pump I bought from WalMart

http://www.walmart.com/ip/Schwinn-Te...-Pump/17247743

I later found that the pump caused the tire's original tube's valve to snap because I wasn't able to hold the pump while pumping air into the tire so I probably pushed the valve too much.

I had a friend give me a lift to the local bike shoppe and they replaced the tube on the tire for me. I went to a local restaurant that evening on my bike and then when I went to use the bike again a few days later the tire was completely flat. I took it to the bike shoppe again and they again replaced the tube. Before I even put the tire back onto the bike the tube burst and went totally flat again.

I'm very poor and can't afford to be constantly replacing tubes, not to mention the frustrating hassle of being left without transportation when the tubes burst. The bike shoppe uses Kenda tubes and the man at the shoppe had inflated the tube within the range posted on the sidewall of the tire. I think that brand is just crappy.

Could anyone recommend which brand is a good brand or maybe if there are tires that don't need tubes and if that would be better? I could understand getting a flat from running over glass or a nail but this is ridiculous getting a flat while the bike is just sitting there!