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Search: Posts Made By: RChung
Showing results 1 to 50 of 1000
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Forum: Electronics, Lighting, & Gadgets
05-20-24, 01:51 PM
Replies: 15
Views: 117
Posted By RChung

Then I'll repeat my suggestion: compare the...

Then I'll repeat my suggestion: compare the downloaded elevation profile with the actual elevation profile. What you're looking for is 1) if it was recording properly for a while and then suddenly...
Forum: Electronics, Lighting, & Gadgets
05-20-24, 08:17 AM
Replies: 15
Views: 117
Posted By RChung

Edge units use a barometric altimeter to estimate...

Edge units use a barometric altimeter to estimate altitude, then there's an algorithm to ignore tiny bumps. But if you live in one spot and travel to another, it's often necessary to re-set where it...
Forum: Indoor & Stationary Cycling Forum
05-20-24, 08:08 AM
Replies: 14
Views: 305
Posted By RChung

That's because except for the very highest levels...

That's because except for the very highest levels of eRacing, cheating on Zwift has less than medium stakes. cheating on Zwift has less than medium stakes
Forum: Indoor & Stationary Cycling Forum
05-19-24, 03:45 PM
Replies: 14
Views: 305
Posted By RChung

Several years ago, I got pulled into a...

Several years ago, I got pulled into a conversation with Eric Min and Jon Mayfield about detecting cheating in Zwift. I told them back then that while it would be possible to cheat in Zwift, it would...
Forum: Indoor & Stationary Cycling Forum
05-17-24, 06:08 PM
Replies: 59
Views: 2,640
Posted By RChung

This is a 33% increase over the last 7 years. The...

This is a 33% increase over the last 7 years. The CPI has increased 28.5% over the same period of time. The price has thus increased 33/28.5 = 1.16x as fast as inflation. Whether the product is 16%...
Forum: Training & Nutrition
05-15-24, 02:39 PM
Replies: 35
Views: 1,182
Posted By RChung

We think so, but we're mostly doing age-specific...

We think so, but we're mostly doing age-specific sex-specific cause-specific mortality, and you can't get that by zip code (or even many counties: some counties in the US are really small). That...
Forum: Training & Nutrition
05-15-24, 10:48 AM
Replies: 35
Views: 1,182
Posted By RChung

Not sure. AFAIK, we don't have a lot of...

Not sure. AFAIK, we don't have a lot of longitudinal cross-national measurements of VO2Max. But, as I mentioned in the other post, you have to be among the richest decile in the US to get the average...
Forum: Training & Nutrition
05-15-24, 10:32 AM
Replies: 35
Views: 1,182
Posted By RChung

Alas, we've also looked at trends in life...

Alas, we've also looked at trends in life expectancy by income levels. Males have to be in the top 10% of income in the US to have the same life expectancy as the *average* in the UK: the other 90%...
Forum: Training & Nutrition
05-15-24, 09:28 AM
Replies: 35
Views: 1,182
Posted By RChung

On the other hand. ...

On the other hand.

https://cimg0.ibsrv.net/gimg/bikeforums.net-vbulletin/2000x1093/screenshot_2024_05_15_082335_c62a20a062dce0fa5a40fc8b00abd1d08f5211c4.png
Increasing disparity in trend of...
Forum: General Cycling Discussion
05-12-24, 11:04 PM
Replies: 7
Views: 493
Posted By RChung

A penny weighs 2.5g, so $4 of pennies weighs 1...

A penny weighs 2.5g, so $4 of pennies weighs 1 kg. I'm guessing that's a bit more than 1% of your total mass, so if you have a steepish hill you can climb it wth a few rolls of pennies in a water...
Forum: General Cycling Discussion
05-11-24, 09:57 PM
Replies: 7
Views: 493
Posted By RChung

Hmmm. 2% ought to be discernible if you do the...

Hmmm. 2% ought to be discernible if you do the right tests against the same standard, but you'd have to be reasonably careful.
Forum: Professional Cycling For the Fans
05-11-24, 11:16 AM
Replies: 30
Views: 1,253
Posted By RChung

https://cimg4.ibsrv.net/gimg/bikeforums.net-vbulle...

https://cimg4.ibsrv.net/gimg/bikeforums.net-vbulletin/672x672/giro24_7_85342ada3300b281ecb3b90df02271642def0281.png
Forum: Training & Nutrition
05-09-24, 03:59 PM
Replies: 6
Views: 228
Posted By RChung

Zones are used to clarify communication,...

Zones are used to clarify communication, especially between a coach and an athlete. The coach may have a specific workout goal in mind and to make sure the athlete follows the plan, more specificity...
Forum: Training & Nutrition
05-09-24, 11:13 AM
Replies: 23
Views: 459
Posted By RChung

Back when I was a grad student, the then-chair of...

Back when I was a grad student, the then-chair of the department, a member of the NAS, used to remind us, "Argumentum ad hominem is, 'Your argument is trash because you're a dick,' it's not 'Your...
Forum: Training & Nutrition
05-08-24, 03:22 PM
Replies: 35
Views: 1,182
Posted By RChung

Which study do you have in mind? The Copenhagen...

Which study do you have in mind? The Copenhagen study used mlO2/kg/min.
Forum: Road Cycling
05-08-24, 09:36 AM
Replies: 35
Views: 1,315
Posted By RChung

There are (at least) three things to consider: ...

There are (at least) three things to consider:

1. Which tire matches your rims best?
2. How fast do you expect to ride?
3. How rough/smooth do you expect the road surface to be?

I would think...
Forum: Training & Nutrition
05-07-24, 09:08 AM
Replies: 35
Views: 1,182
Posted By RChung

Is VO2Max the best predictor of lifespan?

Peter Attia has been saying this, and now a new GCN video repeats it. GCN video

This is not a criticism of the main point, which is that cardiorespiratory fitness is a good thing to have. That...
Forum: Road Cycling
05-07-24, 07:51 AM
Replies: 61
Views: 2,745
Posted By RChung

If only there were some way to account for that.

If only there were some way to account for that.
Forum: Road Cycling
05-06-24, 07:30 PM
Replies: 61
Views: 2,745
Posted By RChung

"Every once in a while someone along the road...

"Every once in a while someone along the road lets us know how far behind we are. A man shouts: ‘Faster!’ He probably thinks bicycle racing is about going fast." -- Tim Krabbe, The Rider
Forum: Road Cycling
05-06-24, 12:40 PM
Replies: 61
Views: 2,745
Posted By RChung

Damon Rinard, my friend now at Cannondale (but...

Damon Rinard, my friend now at Cannondale (but ex-Cervelo, ex-Trek, ex-Kestrel, and ex-rec.bicycles.tech) sometimes says we got it wrong when we started obsessing about how much *faster* a change...
Forum: Road Cycling
05-06-24, 10:40 AM
Replies: 85
Views: 2,983
Posted By RChung

Deflection is not the main "cause" of rolling...

Deflection is not the main "cause" of rolling resistance. When dropped on a hard floor, a basketball will bounce higher than a bowling ball even though the basketball "deflects" more. On a hard...
Forum: Road Cycling
05-06-24, 10:33 AM
Replies: 85
Views: 2,983
Posted By RChung

Back in the day, we relied on Jobst to address...

Back in the day, we relied on Jobst to address this.
Forum: Road Cycling
05-06-24, 09:48 AM
Replies: 85
Views: 2,983
Posted By RChung

Close. The OP asked about both wheels and tires....

Close. The OP asked about both wheels and tires. The tires effect scales like slope, and that effect can outweigh (heh) weight differences. The wheel effect is almost entirely captured by difference...
Forum: Road Cycling
05-06-24, 08:55 AM
Replies: 85
Views: 2,983
Posted By RChung

Oh, I'm *not* saying that wheel weight doesn't...

Oh, I'm *not* saying that wheel weight doesn't matter: I'm saying that the acceleration component of the total effect is small compared to the wheel weight effect. Nor am I saying that the...
Forum: Road Cycling
05-04-24, 09:32 AM
Replies: 85
Views: 2,983
Posted By RChung

Yeah. I think Ballard does pretty good analysis,...

Yeah. I think Ballard does pretty good analysis, though I was surprised that, in that video, he said that he was surprised about the result. I thought that was well-understood even if not always...
Forum: Road Cycling
05-03-24, 11:34 PM
Replies: 85
Views: 2,983
Posted By RChung

Yup. Tom is a very careful experimentalist, and...

Yup. Tom is a very careful experimentalist, and gets high precision results -- better than I, damn him. We didn't do many simulations (a few, but not many). We mostly worked with data that we or...
Forum: Road Cycling
05-03-24, 07:29 PM
Replies: 85
Views: 2,983
Posted By RChung

Thanks. Yeah, GCN doesn't do "science" very well....

Thanks. Yeah, GCN doesn't do "science" very well. I don't think I've had the patience to watch that particular video so maybe that's an unfair assesment (but I've watched other GCN videos that make...
Forum: Road Cycling
05-03-24, 10:24 AM
Replies: 85
Views: 2,983
Posted By RChung

Which video did you rewatch? How have you...

Which video did you rewatch?

How have you done your studies, and your comparisons?


Was elapsed time the thing you were measuring? How did you account for differences in wind or power?
Forum: Indoor & Stationary Cycling Forum
05-03-24, 09:04 AM
Replies: 21
Views: 714
Posted By RChung

Hmmm. There are methods to estimate total...

Hmmm. There are methods to estimate total elevation gain from power, time, and speed. You do need to know total weight and some assumptions about the tires you're using and the contribution of...
Forum: General Cycling Discussion
05-03-24, 08:50 AM
Replies: 7
Views: 493
Posted By RChung

This is what I was wondering about. The left...

This is what I was wondering about. The left pedal is the "master," the right is the "slave," and I was wondering whether you could separately slave a different right pedal (or left).


Right,...
Forum: General Cycling Discussion
05-02-24, 09:37 PM
Replies: 7
Views: 493
Posted By RChung

I don't have any experience with this model but...

I don't have any experience with this model but can you swap, say, the right pedal from your old set and pair it with the left, or vice versa?

You've done a static test (which is good) but the...
Forum: Road Cycling
05-02-24, 07:01 PM
Replies: 61
Views: 2,745
Posted By RChung

Lower gearing allows for lower maximum crank...

Lower gearing allows for lower maximum crank torque and lower minimum speed (before falling over), and thus lower power. Lower gearing isn't so much to make you climb faster, it's to allow you to...
Forum: Road Cycling
05-02-24, 06:35 PM
Replies: 85
Views: 2,983
Posted By RChung

I'd put handlebars between tires and wheels.

I'd put handlebars between tires and wheels.
Forum: Road Cycling
05-02-24, 04:38 PM
Replies: 61
Views: 2,745
Posted By RChung

An eighth of a millenium.

An eighth of a millenium.
Forum: Road Cycling
05-02-24, 02:27 PM
Replies: 61
Views: 2,745
Posted By RChung

https://cimg8.ibsrv.net/gimg/bikeforums.net-vbulle...

https://cimg8.ibsrv.net/gimg/bikeforums.net-vbulletin/672x672/crr_vs_mass_c1c1ee2943760a08180fa8e5f7d0d64fd3a8f866.jpg
Forum: Road Cycling
05-02-24, 02:22 PM
Replies: 61
Views: 2,745
Posted By RChung

https://www.dangerousroads.org/north-america/usa/3...

https://www.dangerousroads.org/north-america/usa/3762-the-10-steepest-streets-in-america.html
Forum: Training & Nutrition
05-02-24, 08:06 AM
Replies: 17
Views: 1,228
Posted By RChung

https://youtu.be/dVXZh6oVhqI?feature=shared

https://youtu.be/dVXZh6oVhqI?feature=shared
Forum: Training & Nutrition
05-02-24, 06:59 AM
Replies: 51
Views: 1,547
Posted By RChung

Let's hope so -- a 15 watt discrepancy is pretty...

Let's hope so -- a 15 watt discrepancy is pretty big, and would affect zones and TSS estimates (not that zones or TSS estimates are that critical -- I'm just saying they'd be affected).
Forum: Training & Nutrition
05-01-24, 02:29 PM
Replies: 51
Views: 1,547
Posted By RChung

Thanks. So, if you rack up 745 TSS in 11h of...

Thanks. So, if you rack up 745 TSS in 11h of riding, it would mean you were averaging 745/11 = 68 TSS per hour of riding time. The way TSS is calculated means that your average "intensity" during...
Forum: Road Cycling
05-01-24, 02:17 PM
Replies: 85
Views: 2,983
Posted By RChung

Ironically, the improvement in speed from tires...

Ironically, the improvement in speed from tires works like climbing a hill: a reduction in Crr (the coefficient of rolling resistance) of .004 (=0.4%) has an effect on speed exactly like reducing the...
Forum: Training & Nutrition
05-01-24, 11:49 AM
Replies: 51
Views: 1,547
Posted By RChung

How many total hours on the bike do you do in a...

How many total hours on the bike do you do in a week to get about 700 TSS?
How many kcals (or kJ) is Strava saying you average across a week?
Forum: Training & Nutrition
05-01-24, 08:44 AM
Replies: 51
Views: 1,547
Posted By RChung

It's a little more arcane than that but that's...

It's a little more arcane than that but that's essentially it. So if 100 represents an hour at FTP, a weekly TSS score of 500 is supposed to represent 5 hours of riding at FTP. Terry occasionally...
Forum: Training & Nutrition
04-30-24, 06:37 PM
Replies: 55
Views: 2,083
Posted By RChung

Yup. You don't really need a PM to make...

Yup. You don't really need a PM to make relatively good estimates on a long steady hill. A PM's strengths show up when the course isn't steady and speeds and efforts are variable. Its value is larger...
Forum: Training & Nutrition
04-30-24, 02:50 PM
Replies: 55
Views: 2,083
Posted By RChung

It's a little simpler when climbing a steepish...

It's a little simpler when climbing a steepish hill because you don't have to worry quite so much about aerodynamic drag -- when climbing a steep hill, there's a rule of thumb that gets you close to...
Forum: Training & Nutrition
04-30-24, 11:23 AM
Replies: 51
Views: 1,547
Posted By RChung

Nancy Howell, an anthropologist who wrote the...

Nancy Howell, an anthropologist who wrote the definitive study on the nutritional strategies and energy expenditures of the Dobe !Kung of the Kalahari Desert, noted that teen males had high energy...
Forum: General Cycling Discussion
04-29-24, 09:51 PM
Replies: 63
Views: 1,938
Posted By RChung

https://cimg9.ibsrv.net/gimg/bikeforums.net-vbulle...

https://cimg9.ibsrv.net/gimg/bikeforums.net-vbulletin/672x672/vam_at_constant_power_0fd4517dfbcac176a579d8edbdc50d2a03e09ed1.png
Forum: "The 33"-Road Bike Racing
04-29-24, 09:26 AM
Replies: 8,475
Views: 788,927
Posted By RChung

Coggan has said several times that the title of...

Coggan has said several times that the title of his book is "Training and Racing With a Power Meter" not "Training and Racing to a Power Meter."
Forum: Living Car Free
04-26-24, 09:35 AM
Replies: 12
Views: 790
Posted By RChung

In the city? We did, when the kids were little,...

In the city? We did, when the kids were little, but the city was Paris. When we moved back to the US, we moved to a place with a "good for US but not good for Europe" public transit system. The real...
Forum: Training & Nutrition
04-25-24, 03:48 PM
Replies: 55
Views: 2,083
Posted By RChung

There are many areas where Hunter and Andy have...

There are many areas where Hunter and Andy have agreed to disagree. That book is sort of "you write that chapter, I'll write this one, and we'll bind them up together." One pretty clear example is...
Forum: Training & Nutrition
04-25-24, 02:39 PM
Replies: 55
Views: 2,083
Posted By RChung

Umm, pretty sure that's not entirely so. Andy...

Umm, pretty sure that's not entirely so. Andy Coggan has repeatedly said that if you have power and RPE (and you always have RPE) then at best, HR is redundant; at worst, it's misleading.
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