Yes, as the sibling says they'd be using disc wheels. I'm a bit surprised that for the OP's speed record they weren't - maybe they were more worried about cros

Yes, as the sibling says they'd be using disc wheels. I'm a bit surprised that for the OP's speed record they weren't - maybe they were more worried about crosswind wrecking the effort, versus absolute efficiency. With rollers (what I'd think the "treadmill" discussed above actually is), and a normal road bicycle, you can feel, or at least hear, the resistance just from the spokes in a spoked wheel when you really get get them spinning "real world" fast. On fancier road race wheels, the spokes are "bladed" for this reason - their cross section is flattened to minimise aerodynamic drag. Remember that when you're riding a bike in normal conditions, the top of the wheel is hitting the oncoming air at up to twice the speed of the bike. Though, there's also a substantial amount of appearance/marketing/armchair-engineering around...