Harley riders are the riders. Well, the most notorious anyway. They are the most popular kind of motorbike/chopper riders, they're sometimes like street gangs, but with motorcycles and crusty white dudes.
Um, assuming you got the last line, I'll try to explain the other part. I saw that anime (not sure what it's called, not going to guess), and I thought of this page—specifically, you and your avatar. The moment I walked in was them explaining the dog in your avi and signature, and I chuckled out of the unlikeliness of me walking in at that specific moment.
I know you might be thinking some weird guy with a bandana and jeans or some shiz when I mentioned Harley rider, but to assure you he's not that personification, I'll tell you - he's British and is a Perma-resident here in the States, and his hair is the spitting image of the hair of Giorgio A. Tsoukalos, a.k.a. ↓
I just saw the anime in your avatar, and I'm thinking this page the entire time. See, I haven't watched any anime in so long I can't even look at it without a messed up grin on my face. Yes, that includes Pokémon.
I have changed my imaginitive fuel from canon gasoline to fanon diesel.