I'm looking at the bike and while I understand the basic info about it, I don't know how they operate. How do you ride it? I see it has a shift lever, but it doesn't appear to have a clutch lever. What's the lever for and when do you use it? There is a cable attached to the rear brake, It looks like it attaches to the left handle bar lever, but what's it for? Is it like a hand brake because its an auto?