Originally Posted by Carbonfiberboy

In the famous tandem group coast-down on Mt. Ventoux, the rim brake bikes were the only ones not to have issues. There were no Arais (2 lb. penalty). Overconfidence and maybe lack of feedback. I know several rear disk bikes which have warped their disks, one that overheated - the bike went into the woods but was OK. Nothing's perfect except maybe dual disks with big laminated rotors. But there's the weight again, so kinda back to the Arai. Gotta get ride of the heat somehow. But disks are certainly potentially safer. Arais don't do what they do.