Motorized bikes have to deal with something that bicycles don't really need to worry about, tire balance. Our wheels spin faster than a bicycles and therefore we need balanced wheels like an automobile or motorcycle. I discovered Dynabeads on the web and it is a way for us to dynamically balance our wheels without ugly weights or special equipment. it's really a cool system. They are ceramic granular balls small enough to go down the valve stem of your bicycle tube and they instantly balance your tire when you hit about 10 mph. And it is a perfect balance. No kidding, I put one ounce in each of my tubes and rode down my street to my Parents house about a quarter of a mile away and right away noticed a HUGE difference! It is amazing how smooth and stable it makes your bike. I have this link for how it works. You need to see this video! You cannot use this product in conjunction with slime as it will prevent the beads from getting to where they need to move freely to. DynaBeads demo video - YouTube It's not a gimmick as it really works and will make your bike feel like you are rolling on glass! It is not expensive at all. I bought enough to do five tubes for about $20 online and you can cut the tube open if you need to replace the tube and reuse the beads for another tube, so it will last a long time. Trust me when I say this is the biggest gain in ride quality for the least amount of money you will spend. Simply awsome!