dlinenbe said:As a follow up, has anybody "enveloped" the power calibration of the KK road machine.....
Dave, to be clear, I am not making any statement about the accuracy of the KK Road Machine power data.
If one doesn't have a PM and wants to use a trainer to train with power, there are two issues: (1) a protocol that results in riding specific durations an an appropriate power (e.g., L4) and (2) knowing what power one is riding at.
The only requirement to use a trainer to train effectively with power is the first one above. The second issue above is a "nice to know" but not essential to training with power.
What I am saying about the KK Road Machine is that from several user reports by users who have both the trainer and a PM (SRM or PT) is that it can be set up from day to day to produce consistent resistance and that the power/speed relationship remains relatively constant after the trainer has been warmed up (e.g., 10mins). The facts that the trainer is quiet, smooth, stable and has a road-like feel are pluses that make it a good choice.
I'd be a little careful about trying to get too precise about the exact watts required to ride at a certain speed due to the influence of tires and tire pressure and I'm in no position to know how consistent the resistance is from trainer to trainer (as opposed to the same trainer from day to day).