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Sram Force. He says the bearings need to be to a really high tolerance as they are so small. Which is why they are so expensive. They have Rotor PF41 Steel Bottom Bracket which is only £30
But, with the ULTIMATE CF SLX 9.0 SL (that you posted a pic of last week) it is built with SRAM PF GXP 86,5/91,5 Road bottom bracket.
I hope this helps as I am now getting confused myself....
My mate converted his and had to use the following;
Rotor BB PF-41 for 30 MM spindle
http://www.chainreactioncycles.com/rotor-pf41-ceramic-bottom-bracket/rp-prod130550
$$$$