It is nothing for a big, strong schoolboy to elbow an elderly woman aside in the dash for the last remaining seat on the tube or bus, much less stand up and offer his seat to her, as he ought.

Once the bike's seat tube forms a lock, the only way to steal the bike would be to cut through it, destroying it in the process.

I would tuck the rear wheel in a little closer and steepen the seat tube Angle, for compactness and to distribute a little weight to the feet.