Link?


-bobo

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"What's good for me ain't necessarily good for the weak-minded."

Currently it is not up on the site but if you subscibe to the pod cast on apple or google etc I think you should be able to find it, it came out yesterday but I just looked at
https://marginalgainspodcast.cc/podcasts/
and it is not up there yet.
try this link:
https://www.stitcher.com/...-by-silca?refid=stpr

Enzo Ferrari: "Aerodynamics are for people who can't build engines."

Michele Ferrari: "Ladies and gentlemen, I present to you: Tony Rominger."

HAHA :D

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My Blog - http://leegoocrap.blogspot.com

Here's the "Crr weenie" plot we were talking about at the very end that converts a difference in Crr to an equivalent weight penalty at different slopes and compares that to an extra 500g.

If you're a weight weenie, you should definitely also be a Crr weenie.

I would love to see a similar graph showing the issue of apparent weight vs tire pressure effect on CRR. From what Silca has posted in past on either side of optimal there is an increase in CRR (and it seemed the slope was worse to high than too low). In the podcast it was mentioned that the change in CRR between say the Conti 4000SII and the 5000 was equivalent to riding uphill at a certain slope and that over a certain distance it was like climbing to the top of the highest point in Indianapolis. This was an eye opener.

That plot helped solidify my thinking.

Back when you shared that graph, i did quick math and gatorskins vs gp5000 was like riding up a 0.35% slope at all times.

I started as a weight weenie as it was an easy concept, but i quickly morphed into a training/weight/aero/and crr weenie. But on my tri bike i admit that i basically ignore weight.

What i found was that you can see big gains in all areas... but the benefits from reduced (bike) weight were the most marginal.

Sorry everybody, the MarginalGains site is on hold at the moment as the person updating it has been on the road all week (and quite honestly, none of the rest of us know how to do it!). Try iTunes or Stitcher in the meantime.. (also, if you have an iTunes account, please subscribe and leave us a review.. it really means a lot and key words you use in the review will help other people find the podcast).

The challenge to making graphs like this around pressure related effects are that these continue to be so driven by both tire construction and road surface. So lower Crr tires with more supple casings have flatter curves, ie less slope either side of the break point. While smoother, lower void surfaces also create shallower curves.. so without knowing the exact surface and tire it is very hard to precisely say how many watts it will cost you to be 5psi too high or too low, outside of some specific examples.

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http://www.SILCA.cc
Check out my podcast, inside stories from more than 20 years of product and tech innovation from inside the Pro Peloton and Pro Triathlon worlds!
http://www.marginalgainspodcast.cc

Thanks for the mention (Damn me <LOL>) :-)

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http://bikeblather.blogspot.com/

It would've been just a parlor trick without you.

You know, the Nobel in physics is mostly given to experimentalists, not theoreticians. Theoreticians sit around and don't really have to worry about whether it's true or not. The experimentalists are the people who actually figure out how to test the theory.

Well...I've always said that the Venn diagram of people with your particular background in data analysis/modeling and an interest in evaluating bicycle power meters is a pretty thin sliver of an overlap.

You also need to thank the Ciclosport HAC4 computer and it's barometric altimeter "power meter" function for existing...if you weren't curious about how well a HAC4 was as a power meter, you might not have taken a look at how well a power meter could function as an altimeter, right? ;-)

Good segment. I recall at the time I reached out to you to see if you were interested in seeing the power files from my runs thinking, "This is a busy guy, and I'm sure he doesn't have the time or interest in looking at this. I doubt if he'll even respond." Thanks for responding.

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http://bikeblather.blogspot.com/

Sorry for being late, but the Robert Chung interview is now up at MarginalGainsPodcast.cc

This interview was so fun, and I can pretty much guarantee there will be a second one as we went found ourselves onto about 5 more topics after we finished recording.. but have to do the Tom A. interview first!

You can find it on iTunes HERE

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http://www.SILCA.cc
Check out my podcast, inside stories from more than 20 years of product and tech innovation from inside the Pro Peloton and Pro Triathlon worlds!
http://www.marginalgainspodcast.cc

I'd listen to that.

Nice chat. Only heard about it the other day.

I heard my name was mentioned and a chart I'd created about impacts of altitude.

For anyone wondering this is the chart where it can be found for some context of its content:

https://wattmatters.blog/...record-part-iii.html

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http://www.cyclecoach.com
http://www.aerocoach.com.au