Let's be very clear about something. Rims for racing bikes, such as the Mavic Open Pro and Velocity Aerohead, are made for people who use bicycles in races. That's why they're called racing bikes; because people actually race with them! To be a competitive road racer, you will not want to weigh much more than about 160 lbs. Even at that weight, you'll find yourself at a significant disadvantage in many road races, at least those with any hills. Since the manufacturers of racing rims are aware of this fact, they don't bother making these rims strong enough for 230 lb cyclists, regardless of whether those 230 lb cyclists have the curious notion that it would be a good idea to ride a bike with "racing rims" and 23mm tires.