Ratz has earned the "I installed the Power2Max Rotor 3D onto a Vendetta" badge.
Holly crap batman that was a challenging install. Love my bike but I'm not going to morn the death of the BB Cup Clamp; and the self ejecting derailleur hanger.
The power meter spider just just just clears the BB Cup Clamp. To get a working fit I had to gently file the paint off the weld of the clamp; my frame had a sloppy right-side weld compare to the left side. So patience and care resolved that. Then I had to offset the clamp alignment to the left 1mm to allow for the Rotor and Enduro Bottom bracket preloading. The Rotor clamp preloads the BB against a o-ring on the non drive side; and the Enduro BB uses a wave washer to pre-load the drive side. This actually worked well together to give the power meter the correct clearance versus the BB. In the end it worked good and spins great but having never worked with the rotor cranks before (slightly modification of Shimano's system) it took too much thinking. There is a longer spindle available as an option from rotor and that probably would work well; if paired with BB cup 2mm MTB spacers on each side. I considered that mid way through but wasn't sure I'd like the Q-factor; so the paint got filed instead.
If anyone else attempts to do this in the future feel free to PM me for detailed steps to save you time. (If you don't have the power meter then it would a simple straight forward install).
So now we have a power meter that can actually measure Qrings. Sampling and calculation rate on this unit is 50hz, so the variable angular moment is accounted for.
FYI I ordered the GXP BB on error; thanks to great design from the RWC guys All I had to do was pound out the right side shim and the BB converted into as shimano 24x24 BB. Brilliant design.