Ah,

The scienctist / mechanic synergy proves its value once again. I had not observed the relationship between toppling and the height of the center of gravity. But it is now SO obvious. I KNEW the BF had smaller wheels, and I KNOW enough physics but I did not make the connection of the height of bike, and topple tendency.

So when I find my 27" bike lying helplessly on her side, I needn't blame my lil' old kickstand, who is doing her best. It should also teach me some humility when something obvious eludes the common sense of someone else. And I get annoyed at their lazy thinking .

Thanks for your insight,
Mary