Okay, maybe having two bikers doesn't mean they're "squared" per se. I like math.
I find square crops about the hardest thing to work with, compositionally. Mostly, I don't like square cropped photos - I alwayse feel like I'm missing something, or someone's trying to cover my eyes from behind with their hands. Maybe I have issues? I think a good square crop either keeps you rotating through the image, sort of using your eye momentum to bump back the borders and out the space so you can dwell in it, or it leads you in and out, preferably from one of the flat sides (not a diagonal).
The original of this shot had a big street sign to the right of the frame that dominated the shot. I didn't like that, so I wanted to get rid of it. I also wanted to highlight the colouring in the reflections off the building, but at the same time, not lose the bikers and their beautifully stretched shadows. Hope it works!