Some people on this forum may not agree with me, but I feel that any bike is only as good as its mechanic. Now allow me to clarify that. Some bikes have weaker frames or substandard quality of parts. There is not much that can be done for a bike with poor structural integrity. If a frame is junk, its. junk. mechanical components can ALWAYS be upgraded, so there is no reason to go out and spend $200 on a brand new bike just because you are having problems with your wheel. You can get a heavy duty coaster wheel for around $50. I may be getting ready to have my rear wheel trued up in a couple days, depending on my $$$ situation. If I do, I plan on removing the sprocket before having the wheel trued and reinstalling it after. I will take pictures of each step and post it as a detailed tutorial. I know that others have written tutorials, but it sounds like you need detailed pictures and instructions. Even if you do buy a new bike, you will still need to know how to properly install your rear sprocket. But it will save you a ton of $$$ if you upgrade your wheel and learn how to do things properly. Its true that you get what you pay for, but you also get out of something what you put in. Learning how to do things the right way and putting in a little extra effort will save you a ton of money in this hobby.