Noticed a few cats rollin' on them. They look nicely made but wonder are they stiff?? I dont have alot of experience with any Zipp product. I currently run CXp33's on formula hubs, 3 crossed, tied and soldered. They are stiff, but I grow learly about inflating my vittoria's up to 160lbs. The thing im sorta questionable about is that the 404 has radial spokes on the front. I weigh 180lbs, my local track is steep.