I ride Ksyriums on my road bike. I think the spoke count is 20 rear, 16 front. I weighed in about 280 and commuted on them carry a 25 lb bag. They have a maybe 5000 miles on them and are as true and solid as the day I bought them. I bought them after I talked to a Mavic rep at the Tour of CA a few years ago and he said they were much stronger than the 36 spoke Open 4CD's he saw on the bike I was riding. I'm guessing the Aksiums are just as strong, but you have to be willing to take the risk. That should give you some weight parameters.