Power torque cranks did not exist when Chorus was 10 speed. If you have power torque cranks, they are not Chorus, all Chorus cranks for 11 speed drivetrains are ultra torque, not power torque. Bottom bracket cups for power torque are not the same as ultra torque cups. I have 10 speed Chorus ultra torque cranks on one of my bikes. They only made 10 speed Chorus with ultra torque cranks for a couple of years before they switched to 11 speed