Hmm, I think I get about a B since I U-lock the frame and rear wheel to a sturdy bike rack and cable the front wheel and frame also to the rack, but my seat has a quick release and isn't locked to the bike. I take everything with me that I don't want to lose (saddle bag, lights, water bottle). However, I'm usually locked next to other bikes that would get about a D so I think I'm an A if we grade on a curve