Wheels are Tune Prince/Princess (the Prince with new freewheel), Alex XCR-Pro Scandium rims, DT aerolite spokes (32 each), DT standard alu nipples, Tune AC16/17 skewers.
Rims are 30g (each) lighter than those DT carbon ones. Very difficult to get hold of, had to buy a replacement rear from a one-man-band in America. The one without the eyelets didn't last, so I've gone for one with, added 20g unfortunately, more than cancelled out the hub upgrade.
Still silly light, although I'm 9st12 so can get away with it. Also use DA 12-27 cassette, R1 floating rotors 160mm both ends with Tibolts torx-head rotor bolts, Racing Ralphs Evolution 2.1", Schwalbe SV14A tubes and (heavy) velox cloth rims strips.
Not a lot of rotating weight.
What's the guy with 980g set using? I'd be surprised if he's got disc hubs lighter than mine and can't think what rims they would be, even the Edge carbon tubulars would 'only' save 100g/pair over the Alex XCR-Pros. Is it quite heavily tuned rather than off the shelf bits? The MSC carbon set are 1140g, they look nice.