AeroPod, PowerPod and Newton

So I've switched over to using my iBike instead of my PT, which is awesome. But I've also encountered a problem. When I was testing the iBike against the pt, I was mostly looking at post ride numbers in WKO+ -- these were accurate enough to get me to switch.

Over the last few days I've been using the iBike as my actual pacing device and I've noticed a pretty consistent wattage discrepancy between in ride and post ride numbers. Looking back over the last couple of weeks worth of comparison ride files, I'm seeing that this pattern is pretty common. I'm including yesterday's ride file and would be super grateful if someone could have a look. Looking at the power correction window, you can see at mile 5 or so that the Slope/Difference plots begin to climb away from the elevation. Today's ride matched this pattern perfectly.

What exactly does this indicate? Is this a profile problem? Something which is fixed in the Gen III unit (this is a Gen I!)?

That is the major improvement with Gen 3. The numbers you see on the iBike Gen 3 are almost identical to the post processed numbers. In fact for almost all of my rides, my pre and post analyzed numbers are less than a watt different. I have ridden with the iBike and a power tap at the same times and it's amazing to see just how well the two track each other in real time.

Your profile looks really good! And I am positive you will be very satisfied with an upgrade to Gen 3.

Boyd

When you say the numbers before and after analysis are within one or two watts are you referring to the entire ride? I also find that to be the case, but it's the shorter intervals between 2 - 20 minutes where the post analysis can vary the results between 5 - 15 watts. Doesn't affect the overall ride wattage which is fine for tracking TSS, but the interval work is where it really matters for me in regards to "on the bike" readings. I thought this might be due to an incorrect CDA which was causing inaccurate reading at higher speed, but yesterday I was doing slower hill intervals and there was still about 5 - 8 watts difference post analysis. Any ideas?

Thanks