Hi everybody! I'm new to motorcycling and I've got just a few questions. My first question is this: Does engine displacement affect bikes the same between Sports bikes and other bikes? e.g. is a ninja 250 going to have the same as a honda rebel 250 or other similar bike? Keep in mind I know next to nothing about motorcycles. My second question is in regards to helmets. I know that at some point the price of helmets doesn't affect safety, but merely for looks. I would like to know at what price is my safety not compromised? I don't want to spend an extra couple hundred bucks just to look cool.