I just bought a new bike tonight at Walmart. Its a Roadmaster Mount Fury but the problem is that when I was riding it back home since I took the bus there, the chain was rattling or some other thing was rattling a little as I rode home. Do you know what this would be? Is it easy to fix? I had to exchange the first bike I got tonight cause the kickstand was way too tight and then the guy discovered the front wheel was whobbly too. I hope someone can help me out since my knowledge with bikes is quite limited.