they are stiff enough for me, i can't tell any difference from 717s or crossmax sl. they really weigh 1210 grams.ABRider said:How flexy are these wheels? At an advertised 1210 grams for the pair according to the Stans website they are incredibly light (lighter than my road wheels), and I would think that they might be so flexy that they would feel squirelly on the descents. As a frame of reference, I am a 150 lbs Sport XC racer that rides with a fairly light style but in rocky (Colorado) XC courses. I currently race on the new XTR 975 Scandium wheels and find those to be plenty stiff (laterally) for me. Historically, I have not been very sensitive to wheel flex even with very light weight builds, but I have never ridden a mountain wheelset even approaching this weight. Did the wheelset really weigh-out to 1210 grams as advertised? Maybe the 7000 series rim is unusually strong for its weight. How often do you have to true these? Have you had any reliability issues with the American Classic 225 rear hub? The reviews here on MTBR seriously question the reliability of these hubs and it is certainly a lot to pay for a wheelset. Would it be possible to use these also as everyday wheels for XC if you are using relatively high volume tires (Maxxis Monorail and Crossmark-rear) on them. I have other bikes for super rocky technical trailriding and would only use these wheels for XC. I tend to like to race what I ride regularly so the feel on race day is not real different. Sorry for so many questions but it is hard to find anyone who has ridden/raced these wheels yet. Any color on these wheels would be greatly appereciated. Thanks.