Selling my Quarq Cinqo powermeter attached to a standard (130 BCD) Truvativ (SRAM) crankset. I ran DA 7800 on these cranks and it shifted just fine, all the time. SRAM GXP external bearings included.
A new Quarq will set you back between $1600 - $2k. Save some cash by buying mine.
Crankarm length is 172.5mm. I can swap in 175mm crankarms. You would then need to send it to Quarq, in South Dakota, for recalibration- which is a free service, excluding shipping both ways.
This is for a traditional, threaded bottom bracket with external bearings. It can be made to fit the newer BB30, with an adapter from any decent LBS.
Asking $1000. Willing to entertain reasonable offers. Will trade for Canon EF 85mm 1.2L lens.