Look guys, it works but there are lots of variables which is why I asked people to come out of the woodwork and show there setups. Here's a post from the road forum, but same deal as to how it generally works with the SRAM cranks:
If you're interested in using a powermeter the NEW RED Quarq BB30 crank will work with these cups in your BSA 68mm frame. It is similar in contruction to the S975 but uses the new graphics and chainrings (and quarq). The reason it works is that instead of preloading the bearings with a wavy washer (standard red/force) there is a threaded collar and sleeve. This takes up more room, when removed you have room for the external bb30 cups...just use a wavy washer to preload the bearings.
AFAIK the Force22 crank is basically the same arms/spindle used on the RED Quarq crank - I was just surprised there was enough room for the extra 5mm width of BB shell. It's also easy to tell that the Force22 crank is a BB30 version because the crank bolt is on the drive side.
I'm not seeing any 30mm spindles long enough to do this.
With S-Works cranks it works great, but only 68mm shells. And yeah, a fair few SRAM models.
Plus, why would you bother? The end result would be no better than a regular GXP setup.
This is Weight Weenies right? A BB30 version of the SRAM cranks with THM cups and a wave washer will weigh less than the GXP version.