Miller wrote:You're right, the Campag tech manual says 10nm. I picked up 8nm from somewhere though, perhaps a shop, or is it printed on the bars... can't check quickly as they're covered in tape.
I just looked up the specs from Thomson as an example. They say not to use more than 5nm. They also have some terrible CYA language saying that carbon bars shouldn't be used for more than 3 years, and bars used for racing should be replaced every season... so take that for what it's worth.