But the same statement goes for losses. What if you make the change and see a loss. Doesn't mean it was the new equipment.

I guess the bigger question is can we trust anything that is not tested by an outside independent company.

Lol I'm trying to read your shit right not!!!

for it....you need a power meter. One that is NOT single-sided.

Can you do both? Is that allowed?

ppffttt. I do all my aero testing using heart rate.

Can you do both? Is that allowed?

Oh yeah? I do mine with RPE, and the feel of the wind against my face. I can just feel if its faster.

Power tap hub?

I just do whatever Jan does.

Sincerely,
Lionel

I read his book when I started in the sport. The info was okay and most of the info easy to find if you are a geek. I don't think it influenced me much except holding off for many years before buying carbon aero rims. However, that was more confirmatory than eye opening.

I should review the book, but looking him up now there's something that doesn't vibe well with me. As a geek, I'm constantly looking for the most up to date info. He didn't continue that. It seems like he disappeared. He deleted his twitter and doesn't have anything new posted online except this: http://jim-gourley.blogspot.com/
His velopress bio, it states he his a multiple ironman finisher. I can't find one finish. He keeps bragging about being a rocket scientist. His bio reads like he is twisting the truth. I could be wrong. Since he graduated with a degree in aerospace engineering, he might be working on something top secret.

Also, I know a bunch of engineers and scientists that work on spacecraft and rockets and none of them have ever called themselves a "rocket scientist".

You sound like my boss when I ask what the priority tasks are? His response is they’re all top priority

ppffttt. I do all my aero testing using heart rate.

The power meter doesn't need to be accurate, it has to be consistent, but that isn't what the author was trying to convey. It's a statistics problem.

Even if your meter is dead on every time, your body isn't functioning the same every time. Your position is different every time regardless of how careful your setup is, your speed measuring device has error (even a GPS) that varies from day to day, and the road surface conditions aren't the same. That's if you are looking for gains in speed for reduction in watts. If you are looking at FTP it is even more meaningless.

A +- 5 watt change is nothing more than data scatter under those conditions and should be ignored.

“Don’t sweat the small stuff, go for the big gains.”

Maybe this is out of context. Sure, go for the big stuff first. But also go for the cheap/easy stuff, even if the gains are smaller. You would be dumb not to.

The bigger question is where to draw the line on the very expensive marginal gains. That is dependant on your budget, and level of competitiveness.

The power meter doesn't need to be accurate, it has to be consistent,

The power meter doesn't need to be accurate, it has to be consistent, but that isn't what the author was trying to convey. It's a statistics problem.

Even if your meter is dead on every time, your body isn't functioning the same every time. Your position is different every time regardless of how careful your setup is, your speed measuring device has error (even a GPS) that varies from day to day, and the road surface conditions aren't the same. That's if you are looking for gains in speed for reduction in watts. If you are looking at FTP it is even more meaningless.

A +- 5 watt change is nothing more than data scatter under those conditions and should be ignored.