The freehub body is Shimano/SRAM 9/10/11 speed compatible. I ran a SRAM 10 speed cassette with them.

I used them at Ironman New Orleans 70.3 last year in 25-30 mph sustained winds, so I'd say they can be used effectively in any conditions. They're definitely a versatile, fast and stiff wheel set. I also live in central Kentucky where we have a lot of short punchy climbs. The wheels have also performed well under those challenging conditions as well.