@twisty
Wow those instructions are horrible.
The GXP crank is intended to be used with the wavy washer (part 5 in yellow), but as I mentioned if you can space it *precisely* then it wouldn’t be required. The tolerance would include the width of the frame. The powerspline or bb30 with preload adjuster systems obviously won’t require one.
Angry engineer Hambini explains the GXP thing in detail in the below video, WARNING – he swears a lot.
sweary explanation of GXP
Part 5 is on a press fit gxp bb though isn’t it – the instructions aren’t entirely clear but it doesn’t show a wavy washer on the screw in gxp bb?
Rockshox instructions for forks are brill – don’t know why Sram have made the gxp bb ones so s***e!
All I know is I have no wavy washer on my gxp one – the bb and cranks didn’t have a wavy washer included with either part. It’s done up to the 40 something NM of torque and it spins ok and has no play in it. 73mm bb she’ll so no spacers if I remember correctly.
Fingers crossed that’s right – 3rd gxp set of cranks / bb I’ve had setup like this.