Comment by dgacmu

It's very true! (about locking the wheel with coaster breaks)

I broke my jaw this way when I was 6 or 7. :-) Tried to do a 90 degree skid going down a steep alley and did an endo, landing on my chin. Do not recommend.

I mean, I probably would have broken some bones anyway with the way I biked at that age, but this particular one might not have happened without the coaster breaks.

We haven't quite gotten to that stage with my 7yo yet. 12yo wasn't too rough on her bike but 7yo is, um, er, let's say he doesn't have the wisdom of being older yet.