1) front and rear discs
2) front and rear dual pull
3) front disc
4) front dual pull
5) rear disc
6) rear dual pull
7) front & fixie
8) front & ss
9) no break fixie
I would imagine the safety, for a equal level of skill, is related to how high or low you happen to be on that list.
Next week, the top 9 bestest jet planes.