Originally Posted by gaucho777

I don't remember Matrix Iso rims as being especially light. It was their aero shape and hard-anodizing that was promoted above their being lightweight, at least as I recall. I know there are several different models of Matrix ISO rims. Which version do you have? Are you sure about the measurement?

That said, the wheels are probably going to be okay, but not recommended for everyday/city riding. I weigh ~195-lb and ride on a GL330 front wheel (32-hole) without any problems. I used the same wheel when I weighed closer to 225-lbs and it didn't explode. Much of it has to do with the # of spokes and the quality of the wheelbuilder. Also important is how hard you ride over bumps and potholes. Some people are better as absorbing the road so their equipment doesn't have to. For your weight, less than 32 spokes and fewer than 3-cross lacing with GL 280s is probably asking for trouble.