Ive always been skeptical about locking up the way sheldon brown describes. Nothing against the man, hes awesome, and I understand the logic behind only locking the backwheel inside the triangle, but I feel like any common thief who dosent know better and sees a bike with 'just' the back wheel locked will feel more inclined to try pull the wheel out in order to free the bike, potentially fkcing up your rim and even frame. To me just the appearance of a bike with the frame and wheels independently clearly locked is better and safer. Just my 2 cents. Probably an unpopular choice but id get an NYFU chain, it looks scary.