Rotor BSA30 Bottom Bracket

Maybe

Check out this thread, it may have some answers for you
http://forum.slowtwitch.com/...rum.cgi?post=3992861

This ^

I just used one of those to mount a BB30 Quarq on an old aluminum P3 frame. Works well. I don't have enough time on it yet to judge the durability (about all I would worry about due to the slightly smaller balls used in the bearings) but so far, so good.

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http://bikeblather.blogspot.com/

Wheels Manufacturing BB Multi-Shim

No, that goes the wrong way -- allows use of 24mm-spindle cranks in BB30 frames. OP wants to use a BB30 crank in a non-BB30 frame.

 
...besides the Rotor BSA30 BB, another option is to find a GXP S900 crankset and swap the Quarq BB30 spider onto it (the spider interfaces are the same).

Then, put the first spider onto the BB30 crankset and sell it ;-)

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http://bikeblather.blogspot.com/

Just to clarify that this conversion only works with SRAM S950 or S975 or Rotor 3D+ cranks with 30mm spindles that are longer than most BB30 cranks. You can't use a standard width bb30 crank with a BSA bb.

I've got a BB30 Quarq on my P3 using Rotor's BSA30 bb. No issues in the last 6 months.

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Suffer Well.