Ok then, that makes my standing reach 8'1.
Off of no step/one step gather two footed, I can get like 2 inches above the rim so: 10'2-8'1= 25 inches.
With a runup and one footed, since I am a one footed jumper, I can get like 5-6 inches above the rim:
10'5-8'1= 28 inches, and i am 14 years old.
Here is a pic with a one step gather, that i took during photography class at school, I am 100% certain the rim is 10 foot and later on maybe after next class i can get a picture with me with a runup one footed in an indoor gym.
EDIT: Put it as thumbnail now.
Not the best jump/picture, but if i can take another one ill upload it.
If you are wondering btw, I'm 14, 6'1, reach is 8'1, and I weigh about 145.